5.1.1 unknown or illegal alias

dxbdxb2009
dxbdxb2009 used Ask the Experts™
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Hello Experts!

This is my First Question asked to you experts, I hope you will definitely help me out with the satisfactory reply.

We have one mail server hosted into our company with MS Exchange 2003; our domain name called mydomainname.ae . We have added one more domain name into  Exchange Server to receive mail named  Newmydomainname.ae. So I modified recipient policies (E-mail Address Policies) in MS Exchange server to *@newmydomainname.ae. Now users have the primery addresses ending to *@newmydomainname.ae
So everyone has new email addresses into our domain i.e. *@newmydomainname.ae
We want all users to receive the mails for both of the domain.
We have one TrendMicro IMSS server who is responsible to receive / establish SMTP connection from out site world as a SMTP Gateway. The name of our SMTP gateway is MyGateway.mydomainname.ae
Find the below mx record for our domain I get from www.MXTOOLBOX.COM

dxbans1.ecompany.ae reports the following MX records for 'newmydomainname.ae':
Preference      Host Name      IP Address      TTL              
10      Mailserver.newmydomainname.ae      213.42.50.xyz      21600      Diagnostics      Blacklists
20      mail2.emirates.net.ae      195.229.50.xyz      21600      Diagnostics      Blacklists


When I click on Diagnostics to test my mail server it shows the following output: -


RESULT: mailserver.newmydomainname.ae
Banner:      220 *******************************************************************************************************200*****02*2***0*00
Connect Time:       0 seconds - Good
Transaction Time:       1.078 seconds - Good
Relay Check:       OK - This server is not an open relay.
Rev DNS Check:       OK - 213.42.50.xyz resolves to mailserver.newmydomainname.ae
GeoCode Info:      Geocoding server is unavailable
Session Transcript:      HELO please-read-policy.mxtoolbox.com
250 mygateway.mydomainname.ae Hello [64.20.227.13 [266 ms]
MAIL FROM: <test@mxtoolbox.com>
250 <test@mxtoolbox.com>: Sender [281 ms]
RCPT TO: <test@mxtoolbox.com>
550 Relaying denied to <test@mxtoolbox.co [266 ms]
QUIT
221 mygateway.mydomainname.ae closing connection. Goodby [266 ms]



Now when some of our clients send us a mail from out site / other domains he /s he receives the following Non
Delivery Reports:

The following addresses had delivery problems ---
<dxbdxb@newmydomainname.ae>   (5.1.1 unknown or illegal alias: dxbdxb@newmydomainname.ae)

Original-Recipient: < dxbdxb@newmydomainname.ae >
Action: failed
Diagnostic-Code: smtp; 550 5.1.1 unknown or illegal alias: dxbdxb@newmydomainname.ae
Remote-MTA: 194.170.0.118


Kindly Note :
"      In our SMTP gateway IMSS we configure d to receive the mail for both of the domain i.e. mydomainname.ae  &  mynewdomainname.ae
"      We are able to receive mail from all domains if they are sent for  our old domain name i.e.  mydomainname.ae, but whenever the mails are sent for our new domain i.e. newmydomainname.ae we are not able to receive mail from some domains &.like we are receiving from only gmail.com hot mail.com, rediffmail.com etc.
"      MX Records are configured well but  the PTR Records are pointing to our old mail server i.e. mydomainname.ae  &  sometimes  it  points to new domain name  i.e. newmydomainname.ae ( meaning our Mail IP address is pointing to our old mail server named mydomainname.ae )
"      Our internal domain name is still old i.e.  mydomainname.ae, we have to modify it internally including client PC as well as all servers.
Kindly let me know why some of our client are receiving such kind of  NDR?
See the attached file for details.
An earlier reply will be appreciated.
Thanks a lot.
DXD

NDR...-.docx
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Alan HardistyCo-Owner
Top Expert 2011

Commented:
What exactly did you add as your recipient policy?
You stated the following:
So I modified recipient policies (E-mail Address Policies) in MS Exchange server to *@newmydomainname.ae
If you added a * before the @domainname, this will be the cause of your problem.  Remove the * and re-apply the policy.
If this is not the case, please come back for other guidance.

Author

Commented:
I really appreciate for your quick reply,

I have added in the default Recipient Policy, with the lowest priority & the primary address it @newmydomainname.ae
In Property Page under E-mail Address (Policy) it is shown with SMTP @newmydomainname.ae.
It is confirm that I did not added  * before my domain name.
Awaiting for your earlier reply.
Many thanks!
DXB
Alan HardistyCo-Owner
Top Expert 2011

Commented:
Can you email the specific domain details so that i can do some testing for you please.  Details are in my profile.

Thanks - Alan
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Author

Commented:
Many Thanks for your reply,

I have posted my domain names at your email id i.e. alan at it-eye.co.uk.

Pls do the mx & ptr test & let me know as soon as possible.

An earlier reply will really be appreciated.

Best regards,

DXB
Alan HardistyCo-Owner
Top Expert 2011

Commented:
You are using an Exchange server but when telnetting directly to your primary mail server this is the reply I get back from the server:
mailserver.yourdomain.ae claims to be invalid hostname '*******************************************************************************************************200*****02**0':
220 **************************************************************************************************** *0*00
Have you got some sort of Mail filtering going on before the exchange server?
If not, then your mail server is not happy.
Alan HardistyCo-Owner
Top Expert 2011

Commented:
Also - your server does not respond to an EHLO command - but it does respond to a HELO command.
Extract from - http://support.microsoft.com/kb/153119
You can use the HELO command, but EHLO is a verb that exists in the Extended SMTP verb set that is supported in all current Microsoft implementations of SMTP. It is a good idea to use EHLO, unless you believe that there is a problem with the Extended SMTP Verbs

Author

Commented:
Yes, as i discribed very first in my question that we have smtp gateway based on TrendMicro IMSS which allows / accecps mails for both of the domains.
And if you have noted I stated that our new domain name i.e. newmydomainname.ae able to received mail from hotmail, gmail, rediffmail but from some domain it cant....!
What I think it is happening due to Reverse PTR lookup....what you think?
I request you to do a Test Mail Server on www.mxtoolbox.com for both of the domains & look seriously on "Rev DNS Check"
Do i really need to rename the domain internally or not?
Thanks for replying my questions & Kindly reply soon,
Thanks once again.
Best regards
DXB
Alan HardistyCo-Owner
Top Expert 2011

Commented:
Your Reverse DNS pointers are setup just fine as is the rest of your DNS settings.
Your problem has to lie in the Trend Micro IMSS box as it's configuration looks to me like it is incorrect and I cannot help you with that I am afraid as I don't know the product.
Have you added the domain to the box?
Do you manage the IMSS or does a 3rd party manage it?
Can you bypass the IMSS (disable it / unplug it if it is a box) and test without it to rule out problems on your server?
 

Author

Commented:
See Alanhardisty,

As I let you know that we are able to receive mails from gmail hotmail, rediffmail but not from other domain like etisalat.ae for both of the domains.
I my self manage IMSS since it is just rely the mails & check the Virus, spam & mail size etc, if it blocks the mails, our clients recives the error saying IMSS encountered the error with the specipic error & diagnose code,
The bounced mail with the error "5.1.1 unknown or illegal alias" is  not even touching our smtp gateway.
& I have double check in IMSS both of the domains are allowed to send & receive mail from the outsite of the world.
I really appreciate you if you can pass my case to some one who can really help me out, if you think you cant.
awaiting for your earlier reply.
thanks.
Alan HardistyCo-Owner
Top Expert 2011

Commented:
I just sent a test email to administrator@yourdomain.ae and got a delivery receipt.
Who is having problems sending mail to you (specifically)? - email me if you don't want to disclose the details here.

Author

Commented:
thanks once again,
I have disclosed sender email account & the error we receive to you email.
Pls go through it & reply me back.
Awaiting for your reply.
many thanks!
Alan HardistyCo-Owner
Top Expert 2011

Commented:
Nothing received - please can you resend (I have added you to my whitelist on my server).

Author

Commented:
i resend it on the same id ...any alternet email id pls
Alan HardistyCo-Owner
Top Expert 2011

Commented:
Thanks - got that one.
I don't see any problems at your end at all - you are receiving mail happily from gmail.com hotmail.com, rediffmail.com etc and if these can get to you, and I can get to you, then I don't believe the problem lies at your end.
I just emailed you from a customer's computer and that got a delivery receipt.
You say that your test domain has issues sending mail to your new domain.  I think that the problems lie with your test domain.
Alan
Alan HardistyCo-Owner
Top Expert 2011

Commented:
If your domain is quite new and you have been testing the mailflow on your test domain, it is possible that it is using cached DNS settings and using those to send out mail and hitting problems.
If you flush the DNS cache on the test domain's server and local machines then test again - does it work?
Expert of the Quarter 2009
Expert of the Year 2009

Commented:
First thing you should do is go in to your PIX or Cisco ASA configuration and turn off FIXUP SMTP or whatever it is called. That will stop the Cisco from hiding the banner text which does cause problems with SMTP delivery of email.

Simon.
Alan HardistyCo-Owner
Top Expert 2011

Commented:
What's that got to do with anything Simon?
Alan HardistyCo-Owner
Top Expert 2011

Commented:
Ah - okay.  That's why you got your MVP.

Author

Commented:
Thanks for support me!
I received the test mail you sent from your customer's computer,
I do aggery with you that i receive mails from most of the domain but we really have issues with some domans, beleive me we really have problem with some domains,
& testdomain@eim.ae account i have with my isp.
I am very much sure that there is some problem we have with our email system.
As i told you that we are receiving mails very well for one of our domain, but with new domain name we have issue.
Can you pls check for me that do we have DNS records well configured on the internet or not?
Awaiting for your earlier reply.
Thanks a lot.
Alan HardistyCo-Owner
Top Expert 2011

Commented:
Have you got a CISCO box as your firewall? - if so Simon's advice (coming from the Lead Exchange Guru on Experts Exchange) is excellent and should be followed.

Author

Commented:
Yes, we have cisco router & cisco pix as a firewall but do you think that its giving error to some domains as illegal alias & not giving to some domains.....! well you experts might have good knowledge...!
see what exactly we have for mail flow:-
Lease line from ISP------>Cisco Router------->Cisco PIX------>SMTP Gateway--------->Exchange Server----->Outlook Clients.
One static IP with SMTP traffic is allowed from Router & PIX to SMTP gateway & Exchange sends / receives mail using SMTP gateway as a smart host.
How & what commonds I need to run on Cisco devices & on which cisco device need to be flushed or I need to change the domain name on cisco router / firewall?
Pls tell me how i can post /  reach to Simon or you can forward it to him if you fee
l he can guide me best.
Pls reply me soon.
Thanks a lot.
Alan HardistyCo-Owner
Top Expert 2011

Commented:
Have a read of this:
In the network adapter make sure that servers network adapter is pointed toward itself for the primary DNS Server
Simon will be monitoring as he has placed a comment in the question, so he should get notified of further comments.
I would start checking both devices to see if it is set.  This link might help:
http://www.experts-exchange.com/Security/Software_Firewalls/Enterprise_Firewalls/Cisco_PIX_Firewall/Q_22967873.html 
Expert of the Quarter 2009
Expert of the Year 2009

Commented:
Reading back through the question - illegal alias is not an Exchange error. Therefore the error has to be coming from the SMTP gateway. You need to concentrate on that to begin with.

Simon.

Author

Commented:
Hello Simon,

Sorry for replying you late...
If this was a error from SMTP Gateway how come hotmail, gmail, rediffmail ...etc domain users are able to send mail to my domain users......?
If the gateway has error we should not get anyone of the mail from out side world!
Is the error that we added one more domain name into exchange or any DNS updatation has problem from ISP end.
Is it anything we have to change into router / firewall regarding to changing the domain name updates to tell router / firewall to accept smtp traffic for my two domains or what else the problem is .....!
Pls reply me asap.
I really appricate if you can help me out since we are facing this prob from last 20 days....!
Many thanks.
Expert of the Quarter 2009
Expert of the Year 2009

Commented:
The point i am making is that the error is not Exchange.
Therefore it is something else that is generating the error. You have to look at the path the messages are taking to work out what is generating the error.

If you have two servers listed in the MX records, are you sure that both servers are able to receive email for that domain? If not then remove the other one so that only your server is listed.
If the second server belongs to an ISP then it could be that the ISP has made an error in their configuration - it happens. Most ISPs servers are actually clusters and if one of the clusters is not configured correctly then email can be rejected.

I stress again - it is not an Exchange error, so it is happening outside of Exchange.

Simon.
SurajSenior System Engineer

Commented:
'*******************************************************************************************************200*****02**0':

220 **************************************************************************************************** *0*00

SHOWS THAT THERE IS A CISCO PIX OR CISCO ASA there
you will have to disable the mailguard feature or ESMTP Traffic filter on the firewall..

refer :
Cannot receive & send Mail behind Cisco
http://technet.microsoft.com/en-us/library/dd277550.aspx

x-Sam

Author

Commented:
Simon -
Yes you are right, second server exactly belongs to an ISP, but how can we be sure that due to that second mx point is generating the error & from which server mails are rejected, how can we come to know?

x-sam -
Sorry to say you that i am not a Cisco Pix experts, thus i have to ask what is mailguard feature & what happens if we disable it & how to do that.......?
For mail security we have been using SMTP Gateway which is TrendMicro IMSS 6.0 (software based) as i described the same at the very beginning of my question. we have problem receiving from some of the domains not from all domains.
Kindly reply me asap.
Thanks to both of you to taking interest to solve my prob.
Expert of the Quarter 2009
Expert of the Year 2009

Commented:
Unless you have access to a server that you can send email from and look at the logs, you cannot. I would suggest removing the ISPs servers completely from the MX records and have everything going direct to your network.

The mailguard feature is a waste of space. Disable it, you do not lose anything by doing so. It is well known for causing problems with SMTP delivery.

Simon.

Author

Commented:
sorry for replying you late...
pls tell me the following
how i can disable mailguard on pix? any other after effects by disabling mailguard on pix?
do i need to request my isp to remove second ms pointer or it can be dont from my side anywhere...
pls reply me soon.
thax.
DXB
Alan HardistyCo-Owner
Top Expert 2011

Commented:
SurajSenior System Engineer

Commented:
yea that wil help u wit cisco

Author

Commented:
Alanhardisty - Do you really think PIX can only be the reason of stopping the mails. Can PIX stop mails from some domain?
Since we have receiving prob from some domain but domains like gmail hotmail & rediffmail we dont have any issue...is it also possible due to pix....you experts much be having sound knowledge...
Pls suggest me do i really need to run "no fixup protocol smtp 25" without wrinting into memory, so if I have any problem with this command i will restart PIX to be on previous stage.

I am sorry but do not feel bad...I have full confident on you experts but since I am new with PIX so i am feeling afrad.

Awaiting for your reply.
Thanks
Alan HardistyCo-Owner
Top Expert 2011

Commented:
Have a read of this article - it explains the potential problems:
http://blogs.technet.com/pamal/archive/2008/06/23/cisco-fixup-and-smtp.aspx
The suggestion is that this is not necessarily the solution to the problem, but it will eliminate some of the problems with tracing the problem as Fixup messes with the SMTP commands (restricts them) and can cause problems with delivery.
Turn it off and then write to memory - you can always turn it back on again later if you want to - but I would leave it off permanently.
Expert of the Quarter 2009
Expert of the Year 2009

Commented:
The PIX has been causing problems with email delivery for many years. Microsoft used to have an article on their web site dated 2003 that outlined the issue.
It has reached the point where if I see a PIX, I always say to turn off FIXUP SMTP as it is well known to cause problems.

It will cause problems with certain domains because different domains have different SMTP engines. While SMTP is one standard, they are not all the same. It is like saying you put petrol in a car - but every car is different and works with that petrol in a different way.

Simon.

Author

Commented:
Mestha & alanhardisty :I did the same as you suggested, i run "no fixup protocol smtp 25" and write it on mem, & then check sending the test mail to my domain but just 2 mints later i got the error "5.1.1 unknown or illegal alias" & mail did not delivered. i even turn off the firewall & turned it on(restarding) it but even though there is a same problem,
Is it not a DNS error or any thing wrong with ISP coz we have issue with ISP Email Serders meaning who has the email account with ISP can not send us email & getting  it "5.1.1 unknown or illegal alias"
Can you pls check with some other aspect of the error & suggest me anything else.
An earlier reply will be appreciated.
Many thanks ..!
Alan HardistyCo-Owner
Top Expert 2011

Commented:
I still get the following:
mailserver.yourdomain.ae claims to be invalid hostname '************************************************************************************************22*****200*********2**0*00': <br />   220 ************************************************************************************************22**
Please also remove SMTP fixup / mailguard feature from the Cisco Router.

Author

Commented:
alanhardisty - I again enable fixup smtp on PIX since en idea was not working at all & there is no smtp fixup / mailguard feature on our cisco 1600 router. if it is ...pls let me know where i should look.
As i written in my question earlier that when our client send us a mail on our old domains i.e. dxb@mydomainname.ae it perfectly received & when the same client sends us a mail on our other domain i.e. new/additional domain i.e. newmydomainname.ae the mail is not delivered & our client receives an error.
Note : (Reminder)
1) Old Domain name : mydomainname.ae
2) Additional added on Exchange server : newdomainname.ae

Kindly be noted that for both of the domains mx & ptr is configured well & working.
Any other trick can work out.
waiting for your valuable  reply pls...!
many thanks.
Alan HardistyCo-Owner
Top Expert 2011

Commented:
Please remove the fixup smtp on the PIX and leave it off - if you want our help, please accept the advice given.
Simon is the lead Exchange Expert on Experts Exchange and knows what he is talking about.  He is also a Microsoft MVP (Most Valued Professional) - you don't get honoured with that accolade by not knowing what you are talking about.
We cannot start to troubeshoot your problem with the Fixup in place as it gets in the way.
Please remove it permanently and confirm once done.

Author

Commented:
Sorry once again Alanhardisty -
I have kept "no fixup protocol smtp 25" with "wr me" & requesting you to pls go ahead with troubleshooting.
what all i need to do with the router since we have cisco 1603 router.
I am waiting the positives respond from you experts.
Many thanks.
Alan HardistyCo-Owner
Top Expert 2011

Commented:
Okay - many thanks.
In your question you state:
The following addresses had delivery problems ---
<dxbdxb@newmydomainname.ae>   (5.1.1 unknown or illegal alias: dxbdxb@newmydomainname.ae)

Is the email account setup as dxbdxb@yournewdomain.ae?  I just tried to email the account and got a 5.1.1 error - The e-mail account does not exist at the organization this message was sent to.  Check the e-mail address, or contact the recipient directly to find out the correct address.

Author

Commented:
Alanhardisty -

 if you remember you did a test mail on Sunday on my email id which i sent you on your email address i.e. it-eye.co.uk. (which was delevered to me but as the question arraiges with some other domain like if I send using my other ISP email account like etisalat.ae then i get this error.)

even though I am resending it again on you email address.

thanks once agian.
Alan HardistyCo-Owner
Top Expert 2011

Commented:
Thanks.
Is the newdomain.ae a new domain or was the mail hosted externally at the same host as etisalat.ae previously and you have switched to hosting it yourself?
If so, it could be that the domain still remains on the same host as etisalat.ae and thus is checkes internally to send mail and bounces.

Author

Commented:
Dear Alanhardisty -

For security reasons I have explained each n every thing on my mail which now i sent to your email address.

Pls let me know once you receive it & put your valuable commands.

Awaiting for your earlier reply.

Many thanks.

Author

Commented:
Dear Alanhardisty - did you received my mail or do i need to resend it to you.........
pls reply me as soon as you read it...
awaiting for your reply....
thanks
Alan HardistyCo-Owner
Top Expert 2011

Commented:
Thanks for your additional email.
Do you have a single static IP Address for your internet connection or multiple IP's?
Alan HardistyCo-Owner
Top Expert 2011

Commented:
If I telnet to your primary mail server the message goes through happily and you hopefully receive the message.
If however, I telnet to your secondary Mailserver - the message claims to go through but I get a message from my Anti-Virus software to tell me that the message failed.
I am convinced by this, that the problems lie with emirates.net.ae as this is the same mail host that hosts mail for the test account that fails to send to you.
If you remove the second mx record from the new domains DNS settings and wait 48 hours, I expect that all people emailing you will reach you unless they use emirates.net.ae as their mail host.
Please try this and report back.

Author

Commented:
Thanks for your reply!
We have static multiple IPs but for mail traffic we have one dedicated IP.
Yes, I have received you test mail on my official email address.
what kind of error msgs you got from your anti-virus & what it indicates us?
mail2.emirates.net.ae is the one of the mx server of etisalate with which we did the mx records setting, as you must have seen in http://mxtoolbox.com while checking mx records for our server.
Yes, when ever some of our clients send us any mail who has email account with our ISP / etisalate we did not receive it..!
what I understand from your troubleshooting is - we should remove the second mx record which belongs to ISP mail server, then all mails will be sent directly to our mail server....am i right?
Now the point is that since etisalat is an ISP so many of the email servers might be using emirates.net.ae as there primary or secondery email server pointer (mx pointer) & here etisalat is only one ISP here thus each one has to go through this ISP / Etisalat.
Even we never know who is going to use etisalat or not?
Pls clear my dought & help me to solve this issue, since we have been facing this problem from more then 3 weeks.
An earlier reply will be appriciated!
Thanks a lot .
DXB
Co-Owner
Top Expert 2011
Commented:
The message my Antivirus software came back with was essentially telling me that the mail could not be delivered - no doubt if it was more detailed it would say 5.1.1 Address Unknown.
Yes, when ever some of our clients send us any mail who has email account with our ISP / etisalate we did not receive it..!
The above confirms that the problem lies with yout ISP as whenever anyone using your ISP sends you a mail, it will look internally for your mail server, find it and then because you don't have the email address setup on their server, the message will get rejected.
Anyone outside of the ISP will not have any problems unless they manage to pick up your secondary MX record and then this will fail too.
The long and short of it is you either need to talk to your ISP to get them to resolve the problem concerning the bounces as this will be a problem until they resolve the issue, or you need to add your email addresses to your ISP's mail server and test to make sure that they get delivered to you one they receive them.
The nice thing to know is that the problem is not a problem with your systems.  Not that this makes the problem easy to resolve.
You can remove the ISP's mail server from your MX records, but that won't help the people who use the ISP as their mail provider - so concentrate your energies on your ISP and don't give up until you get a solution from them that resolves the bounce issues.  IT IS THEIR PROBLEM.

Author

Commented:
alanhardisty - I really appreciate for the troubleshooting you did to help me, may thanks for the same.

Now I agree that the problem is really residing on my ISP end, so I mailed them but according to them there is no problem in there end, they are  saying that we have checked mx & PTR records they are perfectly well configured the problem is in your mail server or your mail server is down.

So is it possible you can tell me any way, i can let them know that they should do the specific test or reconfigure some records into there mail server so some thing else......!

Can you pls tell me the test / process you performed on both of the mail servers be which you cam to know that problem is in ISP mail server, so i can tell my ISP technical department to perform the same, thus the problem can be solve soon,
I hope you will really try to understand what i mean......!
Awaiting for your earlier reply.
Thanks once again.
DXB
Alan HardistyCo-Owner
Top Expert 2011

Commented:
Hi DXB,
What I did was to run reports on the three domains you have email accounts for (http://www.dnsstuff.com) and record the MX record details for each domain. You can use http://www.mxtoolbox.com/index.aspx just as easily.
If you do the same, you will have the primary MX pointing to your server for the two domains you manage.  The secondary MX records all point to your ISP.
The email domain that you sent test messages from that failed, have similar IP address to your secondary MX records.
I then configured a new SMTP Connector to send out email for your new domain on my Exchange server to send via your ISP's server rather than use DNS to locate the server and I got the message:
    --- The following addresses had delivery problems ---
<you@newdomain.ae>   (5.1.1 unknown or illegal alias: you@newdomain.ae)
This proves that when mail is sent to your ISP for your new domain that they are not configured correctly.
I will forward the email I got - just tested it again - to your email address.
Alan

Author

Commented:
Hello alanhardisty -

First of all I am really sorry for replying you late & i mistaken delete you mail which you sent resandly on my personal ID; regarding the troubleshooting for this problem.
I have again requested to my ISP to look into this matter but they really checked & concluded that there is no error from there end.
I greatly appreciate if you can seriously look into this matter with dedication upon my personal request.
I again repeat that we have still the same problem described in my question.
We even did not reach at any conclutoin by now.
I request you to reply me ASAP so we can again start for the rectification.
Awaiting for your earlier reply.
Many Thanks!
DXB
Alan HardistyCo-Owner
Top Expert 2011

Commented:
I resent the email so you should get this fairly soon.
You need to sit on your ISP until they admit that they have a problem - I cannot tell you anything else as there is nothing else to tell.
The problem is with them and they need to troubleshoot the problem until they find the problem, not just give up because they cannot find anything.
As I mentioned, I setup an SMTP Connector to deliver mail specifically to your ISP's IP address for your domain.  When I sent you an email, it bounced back as non-deliverable.  That's as simple as it gets.
If anyone x-sam or Mestha are still tuned in - I am sure that they would confirm what I am saying is accurate.
Explain to your ISP what I have just said and the testing I did and do not accept "We cannot find a problem" as an answer.  They clearly have a problem otherwise my mail would have been delivered and all other companies that use your ISP would be able to deliver mail to you too.
 

Author

Commented:
alanhardisty -
I will have to make my ISP understand abt the problem but before that I really need to understand how the mail flow fails using my ISP pipe.
I regrade to tell you that i am not able to understand the mail flow what all i found under the link you said here : (http://www.dnsstuff.com) or under http://www.mxtoolbox.com/index.aspx.
Is it possible you can pls describe me how & which all mail server are stopping the mail flow.
Since what all i see http://www.mxtoolbox.com/index.aspx here when i do a Test mail server for mail2.emirates.net.ae which is my ISP mail server. it is show Ok with PTR also.
******************************************************************************************************
See Here: -
RESULT: mail2.emirates.net.ae
Banner:      220 mail2.emirates.net.ae -- Server ESMTP (I&ES Mail Server 4.2)
Connect Time:      0 seconds - Good
Transaction Time:      1.516 seconds - Good
Relay Check:      OK - This server is not an open relay.
Rev DNS Check:      OK - 195.229.241.56 resolves to aimail3.emirates.net.ae
GeoCode Info:      Geocoding server is unavailable
Session Transcript:      
HELO please-read-policy.mxtoolbox.com
250 mail2.emirates.net.ae OK, [64.20.227.131 [297 ms]
MAIL FROM: <test@mxtoolbox.com>
250 2.5.0 Address O [297 ms]
RCPT TO: <test@mxtoolbox.com>
550 5.7.1 Relaying not allowed: test@mxtoolbox.c [609 ms]
QUIT
221 2.3.0 Bye received. Goodby [312 ms]
*********************************************************************************
but under http://www.dnsstuff.com I really can not understand what all it says.
I again request you to send me the details of how the mails flow is creating problem when it comes to my ISP, thus i can batter make my ISP people understand....!
I hope you will try to understand my problem & will support me.
Once again thanks a lot for being with me.
Best regards,
DXB
Alan HardistyCo-Owner
Top Expert 2011

Commented:
When you use www.dnsstuff.com to lookup your MX records to advise what IP addresses are used for your mail servers, there are two listed.  One is your IP and the other your ISP's IP.  Your IP is the primary mail server address (used in preference to the secondary IP).
When most people send you email, their servers lookup the IP address of the server that handles mail for your domain.  They get the answer that your own server is the serevr that handles mail for your domain.
When someone using your ISP to send you email to your domain looks for the mail server for your domain, they get told that the server is held internally to your ISP.  The message gets sent and gets rejected.
To test the flow of mail to your ISP, I setup a connector that sends mail to your domain but I set it up to send directly to your ISP and not to look up the MX record for your domain and send it to the IP of the primary MX record.
Sending you an email directly to your ISP caused the message to fail.
It is this that needs to be conveyed to your ISP for them to look into and resolve.

Author

Commented:
alanhardisty -

I really want to thank you from the bottom of my heart for the support you provided to me.
As per you suggestion i did not leave my hope / try for the error from my ISP's end & finally they agree that they had a fault in there end.
Now I am able to receive all mail sent using my ISP MX record with my new domain name.

Please accept my thanks once again & hoping to get the same favor in future too.
Best regards,
DXB.
Alan HardistyCo-Owner
Top Expert 2011

Commented:
Well done - persistance pays off in in the end.

Glad they finally admitted the problem and that it is now sorted.

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