[Declude.JunkMail] Spammers bypassing gateways?

[Matt]

I've been wondering about the possibility and I think that I'm seeing 
proof of this now.  With gateway spam blocking services becoming more 
common, are spammers (zombie-types) now starting to attempt direct 
connections to mail.domain.tld instead of relying on MX records?

I've been advising new clients to avoid standard names such as mail and 
smtp for their mail servers due to the possibility of this happening.  
Twice now I have done switches though with servers named mail.domain.tld 
that continued to be spammed directly for weeks after the MX changed 
took place.  The only other possibility that I can think of is that some 
spamware is caching the IP's or MX records.

Has anyone else seen this?

Thanks,

Matt

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