[Mimedefang] Spam sneaking in through secondary MX??

[James Whittington]

This may be a bit off topic but I've noticed spam passing through an
SMTP gateway that is a fallback to the fallback gateway.  I have weights
of 10, 20 & 30 on 3 MX exchanges.  It seems unlikely that the 10 & 20
weight MX records would be unresponsive, which is what I thought would
have to happen for mail to fallback to the 3rd exchange.  The third
gateway by the way does not do Spam or virus filtering.  Do spammers
purposely seek out secondary exchanges to use or are my other two
gateways failing and mail going to the third one?

Inquiring minds want to know...

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James Whittington
Systems Administrator

Excelorant, LLC
A TM Floyd Affiliate Company
1800 St. Julian Place
P.O. Box 8263
Columbia, SC 29202

803.765.1310 | Phone
800.780.1170 | Toll Free
803.765.1431 | Fax

jwhittington at excelorant.com

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