Want to protect your cyber security and still get fast solutions? Ask a secure question today.Go Premium

x
  • Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 358
  • Last Modified:

Unable to received email

Hi all,

I'm a newbie here in EE. I am the Domino administrator for my company. My corporate email is using Lotus Domino 6.5.1. In between the server and the internet, I have 2 boxes of mail firewall (but there is a router and firewall as well that i think is not worth to be mentioned). Recently, I received a number of complaints. There are senders that could not sent an email to my corporate email. They keep on receiving a 4.4.7 error code (I assumed they are using Exchange). Normally, all I need to do is check the Message History on the MXtreme to see the error message. But this time, strange things happened. There was no history of mail that coming from their domain!!!

After that, I ask them to resend an email to my corporate email address, and Cc to my gmail. I received the mail on my gmail but not the other one. Now I'm puzzled of what is going on.

I did a telnet test. I telnet to my mail firewall, use the helo, mail from, rcpt to, subject, data command. The mail can be sent without any issue.

(Because of I'm a newbie here, I'm not too sure about revealing a real information on the domain, ip address, etc is legal. I knew that some of the free accessed forum forbid the user from revealing the real information. Please let me know if EE allow those information to be posted here. Then I will published those information. )

Fyi, there was no changes made on the mail server, dns record, or ISP.

Please enlighten me on this. Your cooperation is highly appreciated. Thanks.
0
term1nat0r
Asked:
term1nat0r
  • 5
  • 3
  • 2
  • +1
1 Solution
 
gupnitCommented:
Hi,
You are getting mails from other domains like yahoo/Hotmail etc, if yes then you have nothing to worry. Also goto www.mxtoolbox.com and verify your domain.
Now if you are getting mail from other domains then, I would suggest:
  • Talk to Admin of that (exchange) domain and ask him to telnet on port 25 of your domain
  • Also they need to check their DNS Cache, maybe wrong IP for your Domain is given
  • Check if you are blocking their domain by any chance
Refer: Numeric Code: 4.4.7

Possible Cause: The message in the queue has expired. The sending server tried to relay or deliver the message, but the action was not completed before the message expiration time occurred. This NDR may also indicate that a message header limit has been reached on a remote server or that some other protocol timeout occurred during communication with the remote server.
Troubleshooting: This code typically indicates an issue on the receiving server. Verify the validity of the recipient address, and verify that the receiving server is configured to receive messages correctly. You may have to reduce the number of recipients in the header of the message for the host that you are receiving this NDR from. If you resend the message, it is placed in the queue again. If the receiving server is on line, the message is delivered. Source: http://support.microsoft.com/kb/284204
Let me know
Thanks
Nitin Gupta (gupnit)

0
 
Sjef BosmanGroupware ConsultantCommented:
The people complaining, are they sending from different domains? Maybe they all use the same blacklist, and you appear on it?

Here's an interesting set of articles:
http://searchexchange.techtarget.com/news/article/0,289142,sid43_gci1182942,00.html

Check there if you're blacklisted.
0
 
fgrushevskyCommented:
check if they are blacklisted, not you. If you were blacklisted you would have problem sending, but not receiving mail
0
Creating Active Directory Users from a Text File

If your organization has a need to mass-create AD user accounts, watch this video to see how its done without the need for scripting or other unnecessary complexities.

 
term1nat0rAuthor Commented:
Dear Gupnit,

I already ask the admin to do the telnet test. They can telnet to my mail gateway without any issue. they already fax the results to me. the test was successful. The server is located at Japan. The users are from Malaysia. The users who are having a problem sending an email is from Malaysia. According to them, they use the Microsoft Outlook, to download the mail from Japan by using POP3.

Dear Sjef Bosman and Fgrushevky,
My domain and the other party domain is not on the blacklisted list. Anyway, thanks for your suggestion. It never crossed my mind. Unfortunately, it was not the solution.

Your kind assistance is highly appreciated. Thanks.


0
 
gupnitCommented:
Hi Terminator :-)
See here I see a potential issue. Guys in Malaysia are using Japan Server for downloading mails using POP3, how about SMTP server, what server are they using.
Ask Malaysia/Japan Admin to test their settings and that would give us a solution.
Thanks
Nitin
0
 
term1nat0rAuthor Commented:
Hi all,

I found this from www.checkdns.net.

CheckDNS.NET is verifying if NS are alive
  Error fetching SOA from gw2.mydomain.com [219.xx.x.x], request timed out. Probably DNS server is offline.
  DNS server gw1.mydomain.com[203.xxx.xx.x] is alive and authoritative for domain mydomain.com
  1 server(s) are alive
  DNS server gw2.mydomain.com failed and will be dropped from other tests

and also this

CheckDNS.NET is verifying if NS are alive
  NS list mismatch: registration authority reports that domain is hosted on the following servers: 'gw2.mydomain.com; gw1.mydomain.com', but DNS server gw1.maydomain.com reports domain to be hosted on 'hq.mydomain.com; gw3.mydomain.com; gw1.mydomain.com; gw2.malaysiaairports.com.my; mydomain.com; gw4.mydomain.com'. Please make sure that you configure the same DNS servers in registrar database and on your DNS.

could this be the cause?

ps: if you need the my domain, pls let me know. your assistance is highly appreciated. thanks.

regards,
term1nat0r
0
 
fgrushevskyCommented:
If your system is set to verify sender/connecting domain in DNS, then the DNS problem that you found could be the issue
0
 
term1nat0rAuthor Commented:
Hi fgrushevsky,
I have no problem in sending mail. the only issue here is receiving email from certain domains. could anybody help me to translate those explanation made by checkdns.net to a layman term? I have a quite limited knowledge in DNS. it seems like some domain keep on querying the gw2.mydomain.com although the gw2.mydomain.com is down due to the SOA record holds by the gw2.mydomain.com. anybody, please? thanks a million.

regards,
term1nat0r
0
 
gupnitCommented:
Hi,
SOA is not an issue as such.
As far as your DNS records are concerned, please verify them and see that correct servers are being identified and used. Modify DNS recods for the domain. Also check via www.mxtoolbox.com
Thanks
Nitin
0
 
term1nat0rAuthor Commented:
Hi Nitin,

I got a fairly good results from mxtoolbox.com. no error found. both of my mx record can be seen. diagnose both mx also gave me a good results.

anyway, any other suggestion? or i should move this topic to DNS thread?

thanks in advance..

regards,
term1nat0r
0
 
term1nat0rAuthor Commented:
hi guys,

finally, the problem solved. the problem was caused by the sender has implemented a new policy on their outbound email. they required Reverse DNS record for every outbound and inbound email. since my domain is not registered yet for the reverse dns, they failed to send an email to us.. anyway, tq for all comments..
0

Featured Post

Become an Android App Developer

Ready to kick start your career in 2018? Learn how to build an Android app in January’s Course of the Month and open the door to new opportunities.

  • 5
  • 3
  • 2
  • +1
Tackle projects and never again get stuck behind a technical roadblock.
Join Now