I'm seeing messages occasionally where the envelope sender is a
verifiable address at someone else's domain, but the from: header
contains some non-existent user @ our local domain.
Can postfix reject those messages?
Can postfix perform address verification on from: or reply-to: headers?
Homer:
Two steps eliminated this problem for us:
1) Accounts with more than 6 failed login attempts in a 10 minute period
are disabled for 10 minutes. This makes brute force methods to find
passwords almost impossible.
2) Limit to 200 outgoing messages per day per user. We'll raise it to
This is not built-in. You can try to do this with a number of
extension mechanisms:
- header_checks with a socketmap: or tcp: based lookup table.
Return REJECT for mail that you don't want.
- External content-filter plugin (Milter, amavisd-new, etc.). Milters
can be written in Python and ot
We're doing sender verification for our local domains, so a message sent from
"f...@plexicomm.net" gets rejected.
A message with an envelope sender of "va...@spammer.com" with a from: header of
"f...@plexicomm.net" gets
accepted. Is there a way to enable verification on "from:" header addresses
We're doing sender verification for our local domains, so a message sent from
"f...@plexicomm.net" gets rejected.
A message with an envelope sender of "va...@spammer.com" with a from: header of
"f...@plexicomm.net" gets
accepted. Is there a way to enable verification on "from:" header address
We're doing sender verification for our local domains, so a message sent
from "f...@plexicomm.net" gets rejected. A message with an envelope
sender of "va...@spammer.com" with a from: header of
"f...@plexicomm.net" gets accepted. Is there a way to enable
verification on "from:" header address
