Increased spam activity
There seems to be increased spam activity last few days. Both rejected connections and marked SPAM has increased on our systems.
Read More »Increased spam activity
postfix
Fighting againts SPAM – postfwd
Postfwd is Postfix firewall daemon. Read More »Fighting againts SPAM – postfwd
Catching unsolicited bounces (backscatter) with SpamAssassin
From http://wiki.apache.org/spamassassin/VBounceRuleset
The “Virus Bounce Ruleset” is a SpamAssassin ruleset to catch “backscatter”.
Backscatter is mail you didn’t ask to receive, generated by legitimate, non-spam-sending systems in response to spam.
Read More »Catching unsolicited bounces (backscatter) with SpamAssassin
Whitelist SMTP Authorized users
Common setup used at many mailservers is postfix with amavis. It is possible to be less restrictive to emails sent by our clients using our server without turning off antispam itself for sent emails.Read More »Whitelist SMTP Authorized users
Removing Received field in mail header with Postfix
If you want to hide email source, you can easily remove Received field in mail header using header_checks.
Read More »Removing Received field in mail header with Postfix