Mails rejected from valid domain

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diadem.support
Posts: 21
Joined: Thu Nov 05, 2009 1:27 am

Mails rejected from valid domain

Post by diadem.support » Fri Oct 01, 2010 2:04 am

We have noticed that some mails are rejected from valid domain with proper reverse DNS. The same mail was received few days back properly from the same sender. Below is the log:

Mail not received now:

2010-10-01 13:55:05 magicspam-plesk[10647]: SPAM[check_dynamic_reverse_dns]: mua=0,ip=[66.196.100.78:web57511.mail.re1.yahoo.com],helo=<web57511.mail.re1.yahoo.com>,from=<silskies81@yahoo.com>,rcpt=<jacqueline@tcg-advisory.com>

The same mail was received earlier:

2010-09-20 11:42:43 magicspam-plesk[422]: HAM: mua=0,ip=[66.196.100.78:web57511.mail.re1.yahoo.com],helo=<web57511.mail.re1.yahoo.com>,from=<silskies81@yahoo.com>,rcpt=<bani@tcgind.com>

Can you explain why this is happening?

wizard
Posts: 48
Joined: Tue Sep 02, 2008 1:04 pm

Re: Mails rejected from valid domain

Post by wizard » Fri Oct 01, 2010 12:12 pm

It's possible that a temporary DNS failure at the time it was 'accepted' caused this.

If it continues to happen it may be worth implementing monitoring for DNS services to identify if this is the cause.

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