adding a reject reason to spam messages

Drew Marshall drew at THEMARSHALLS.CO.UK
Wed Dec 7 08:31:21 GMT 2005

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On Wed, December 7, 2005 04:30, Erick Perez wrote:
> or maybe something like this (extracted from a 421 from aol)
> 421-:  (DNS:NR) 421
> SERVICE NOT AVAILABLE (in reply to end of DATA command)

This is different.

You were talking about *rejecting* mail (i.e. your MTA accepting the
message with a 250 code, processing it and then sending the Return-Path:
address a message advising that their message was scored as spam) This *IS
BAD* as Pete mentioned the Return-Path address is usually forged and some
poor innocent victim gets a load of 'We think your message is spam' mails.

What you see above is a bounce message from the MTA generated by the MTA
doing RBL look up at SMTP connection stage (Most MTA's can do this as a
standard feature. Check the docs for your MTA) and the bounce notification
will be generated by the sending MTA which will include the reason and
usually an URL providing the RBL details, which is what you have quoted
from AOL.

MailScanner can do the first option but certainly not be default. Your MTA
can do the second and not normally with any problem.


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