Dan Schaefer wrote:
It means that if you were using BL at MTA level your SA might never
have seen the message at all.
No your rule would not be "overlooked" 'because the site is in a
blacklist' *unless* you were using the BL in your MTA and rejected
the transaction from a blacklisted IP address and, thus, never
submitted it to SA at all.
If this is the case, then why does my email have the X-* headers in
it? I have nothing in my postfix header_checks to discard the BL
rules. Does anyone have a detailed flow chart of SA/postfix setup and
describes blacklisting? Or even a webpage describing the process?
It's very simple with Postfix or any other MTA.
1) Connection request comes to Postfix.
2) Postfix checks the sending server against its blacklists. If it
matches, the mail is refused.
3) Postfix checks its normal rules and if the sender/recipient/etc is
ok, the message is accepted.
4) Postfix sends the message to SA.
5) SA scores the message and returns it to Postfix (SA blacklists simply
score 100 points).
6) Postfix can now deliver, quarantine or delete the message based on
the score or spam/ham designation returned by SA.
--
Bowie
