It appears that Boris Mutina via mailop <[email protected]> said:
>Any advices, opinions? Many thanks.

Beyond greet pause, I've added a SMTP AUTH honeypot.  My mail server advertises 
the AUTH LOGIN
extension, and if something tries to log in, it always says it worked.  
Needless to say, any
subsequent mail is routed to the spamtrap.

I realize this is more work than tweaking settings on regular MTAs, but for 
anyone who happens
to use mailfront, I have code.

R's,
John

PS: Submission users connect to port 465 or 587 which have real AUTH for real 
mail.
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