[TriLUG] Re: secondary MX

[Lance Brown]

John Franklin wrote:
> Spammers will try all MX records.  If the first one fails with a 5xx
> NO SPAM ALLOWED, which should be a fatal error, it'll try the next one 
> until it gets through or fails on all of them.

Or worse, inject the mail into the lower priority MX servers FIRST,
hoping that they are not as well protected as the primary MX server and
that the primary will let the spam through because the SMTP transaction
carrying the spam came from a secondary MX instead of joe-random machine
on the internet. :-(

--[Lance]

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