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Not able send email to our domain from externally

Hi

We use Exchange 2007 and no one is able to send email to our domain from externally.
But users able to send and receive email within our network,

Any help to troubleshoot this problem will be much appreciated

Thanks
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lianne143
Asked:
lianne143
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5 Solutions
 
Pete LongConsultantCommented:
Has it been working previously?

Have you renewed your domain name - or has it just expired?

Is port 25 open on the firewall?

Can you telnet {your public ip address) 25 from outside?
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Simon Butler (Sembee)ConsultantCommented:
Have you done any kind of troubleshooting at all?
There are lots of tools on the internet that will allow you to see how the internet can see your DNS setup.
Do the senders get an NDR? All services running? Errors in the event log? If free disk space on the Exchange server is low then Exchange will stop processing email.

Simon.
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brendanmeyerCommented:
check the receive connector is set up correctly

my internet connector has:
Auth
->TLS
->Basic Auth
  -> Offer Basic auth only after starting TLS
Permission Groups
->Anonymous users
->Exchange users
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Suliman Abu KharroubIT Consultant Commented:
Check SMTP on http://mxtoolbox.com
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lianne143Author Commented:
It was working previously and all of sudden it had stopped.
I will check if the domain name  is renewed.
I will telenet our public ip and let you know the results.
The senders are not receiving any NDR reports. I tried to send from my hotmail and i didnt get any bounce back email.

On our exchange server the database is on D drive and the free space is:35gb
and the C drive  free space is 1.13GB will this make any issue receiving email from external world.I also restarted the server and it didnt make any difference.

Thanks
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Jason WatkinsIT Project LeaderCommented:
The 1.13GB of free space on C certainly will not help, but may not be the cause of the issue.

This seems like an external problem since local users can send/receive e-mail between themselves, right?

We need more info to troubleshoot further.
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lianne143Author Commented:
Yes local users are able to send and receive email between them selves.
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R_EdwardsCommented:
from an external machine open a command prompt and type the following

telnet {your exchange servers name} 25

you should get a reply that looks similiar to the following

220 Microsoft ESMTP mail service Version: 6.0.ect

if by the exchange name does not work use the ip address

post the results please
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Simon Butler (Sembee)ConsultantCommented:
The amount of disk space is almost certainly the problem. If you look through event viewer you may well see errors about back pressure. You need to free some space then restart the Exchange Transport Service to get the server to start processing email.

IIS Logs is where I would start - everyone overlooks them.

Simon.
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lianne143Author Commented:
If i Telnet my exchange from externally it says:

Connecting To exchange.domain...Could not open connection to
the host, on port 25: Connect failed

I can ping our exchange.domain.. sucessfulluy ,  and so if iam right the domain name should not have expired
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R_EdwardsCommented:
do you have a firewall?  verify that port 25 is open.  check the services and ensure SMTP is started
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Jason WatkinsIT Project LeaderCommented:
Can you telnet to the SMTP service from inside the LAN (behind the firewall)? This will let us know whether or not the firewall is the issue. I don't think it is, but never know.
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lianne143Author Commented:
At the CMD prompt i typed Telnet  exchange 25 and i got the following.

220 exchange.domain... Microsoft ESMTP MAIL Service ready at Mon,
21 Jan 2013 16:04:20 +0000
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R_EdwardsCommented:
have your net admin check the firewall
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R_EdwardsCommented:
that is what you are supposed to see from outside your firewall, something is preventing that.
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Jason WatkinsIT Project LeaderCommented:
Something on the firewall is blocking incoming SMTP requests, it seems.
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lianne143Author Commented:
I am able to send email from my network  to any external domains.

Our firewall is maintained outside our network , I told them that when i telnet the connection failed. They say the telnet will not work because the setup is different, which i will get more information tomorrow.

What is the minimum space  which i need to on C and D drive
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Jason WatkinsIT Project LeaderCommented:
I would try to have 15% free on C, if possible.
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Simon Butler (Sembee)ConsultantCommented:
The amount of disk space that you need on the server is discussed here:
http://technet.microsoft.com/en-us/library/bb201658(v=exchg.80).aspx

The firewall support may have misunderstood you - telnet wouldn't work, but a telnet test to port 25 should always work, because that is basically the same as what an external host does.

Simon.
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lianne143Author Commented:
As per Sembee2

In the event viewer. I saw something intresting on the   event log
Log Name: Application
Event ID 15006
Level: Error

The Microsoft Exchange Transport service is rejecting message submissions because the available disk space has dropped below the configured threshold.

Resource utilization of the following resources exceed the normal level:
Queue database and disk space ("C:\Program Files\Microsoft\Exchange Server\TransportRoles\data\Queue\mail.que") = 96% [Medium] [Normal=94% Medium=96% High=98%]
Queue database logging disk space ("C:\Program Files\Microsoft\Exchange Server\TransportRoles\data\Queue\") = 97% [Medium] [Normal=94% Medium=96% High=98%]

No components were disabled because of back pressure.
The following resources are in the normal state:
Version buckets = 0 [Normal] [Normal=80 Medium=120 High=200]
Private bytes = 0% [Normal] [Normal=71% Medium=73% High=75%]
Physical memory load = 60% [limit is 94% before message dehydration occurs.]

So do i need the increase the space on C drive ?. Will there be any unwanted files which i can delete.

Thanks
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Jason WatkinsIT Project LeaderCommented:
The answer to that depends on what is on C. How much space is there in total?
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lianne143Author Commented:
The total space in C is 40Gb. I have paragon Hard disk manager, so if i take some space from D to C will that be Ok.
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Jason WatkinsIT Project LeaderCommented:
40 is tight, it would be great if you can get 8GB free.
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R_EdwardsCommented:
you should be able to move items to your "D" drive, just don't move any of the exchage data.
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lianne143Author Commented:
If i get 8 Gb from D , and D will be left with 27  Gb, will this  be a problem for Exchange database until i add another disk and expand the array and assign the space to D
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Jason WatkinsIT Project LeaderCommented:
Better 27GB free on D, than 1.13GB free on C.
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lianne143Author Commented:
Thanks very much for helping and much appreciated

After i increased the space on the C , the external mails came through.
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