SMTP and MX records

[Ogobetse]

Hey guys,
I'm pretty stumped here; as is my Lotus vendor.

We've got two servers each on their own T1 pipe. Our MX records indicate that mail1 has a priority of 10 while mail2 has a priority of 50. We had an internal mail issue and decided to shutdown SMTP at the firewall to mail2. Things were going as expected for a day or two and then a few users started to complain that certain outside clients' email were not getting through. We these clients' bounced emails were sent to an offsite email account for inspection the errors were as such, "mail2.domainname.com" is unreachable.

Why would only a handful of clients be emailing directly to mail2? Our MX records are set up correctly.

Thanks for the advice!
Dave Nowicki

 

[ChrisAC]

The only reason for this would be that the primary server was unreachable for that period of time and so delivery would be backed off to the backup MX, mail2. As this would be unreachable then the mail would be bounced.

If the logs of the sending server could be looked at it might indicate why the secondary MX was being attempted.

Chris.


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Chris A.C, CCNA, CCSA
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