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Exchange Delyaing Mails

By markmd ·
I have an exchange 2003 server running on 2003 SBS, it was running well for around a year but recently I have been getting more and more NDR's stating that the mail was not delievered in a timely fashion. I have done some research on this and people suggested upgrading NIC drivers which I did. I have also checked my reverse DNS which is correct and I have checked if I can telnet to the other domain which I can do. MS have suggested issues with the type of firewall in use (Sonicwall) ans given a fix which I have implemented but still no joy.

If anyone has any other suggestions please let me know as I just can not find the cause.

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by BFilmFan In reply to Exchange Delyaing Mails

When you telnet to the domain are you connecting to the SMTP (MX record) domain or some other?

Does the mail deliver to all other domains but this one in an acceptable fashion?

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by markmd In reply to Exchange Delyaing Mails

I try both SMTP MX record and by resolving domain name and do get in. It is only about 2% of the domains we send to all others deliver no problem.

Thanks

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by adembo In reply to Exchange Delyaing Mails

Do you have a SMTP connector on your Routing group? If so, is it set to use DNS or set to send email through another server?

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by markmd In reply to Exchange Delyaing Mails

It is set to use DNS

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by jemile2870 In reply to Exchange Delyaing Mails

are you using symantec version 10. you must go to configuration, and deselect the option to check microsoft exhange mail. make sure you click ok after you uncheck the box or the change will not take effect. when you close symantec, open back up again to be sure it is unchecked.

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by markmd In reply to Exchange Delyaing Mails

I am using McAfee for VS and have checked their knowledge base but still have not seen anything in relation to my problem. I have had some contact with the owners of the other severs and they are telling me the following:

The SMTP connections takes place but after some time the remote host (me) disconnects.

They are running softwares in Linux servers. Mail programs they are using
are main server = Courier MTA (courier-mta.org) and backup server Postfix
(postfix.org)

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