/etc/mail/spamassassin/custom.cf will remain after restart.
Read more about creating your own spamassassin rules.
https://cwiki.apache.org/confluence/display/SPAMASSASSIN/writingrules
https://gist.github.com/jult/9bfdc4d07b44be01a02cc2aaf25b7c39
https://github.com/kawaiipantsu/spamassassin-rules
Pls show your syslog from tracking center.
As you can see it will add 5 heuristic score to spamassassin score and hit my quarantine level 5 spam rule.
Mar 18 15:35:12 pmg postfix/smtpd[115503]: connect from mail.superns.com[218.208.91.110]
Mar 18 15:35:12 pmg postfix/smtpd[115503]: NOQUEUE...
Another option is spamassassin custom rule for subject with UTF-8 encoding.
Add or create /etc/mail/spamassassin/custom.cf with below rules and run systemctl restart pmg-smtp-filter to restart the filter service...
What is your Heuristic Score?
Refer to thread (https://forum.proxmox.com/threads/spam-filter.74719/) regarding clamav heuristic score and encrypted archives.
Show the email in raw format.
The what object rule work for me.
Delivered-To: recipient@mydomain.com
Return-Path: sender@gmail.com
Received-SPF: pass (gmail.com ... _spf.google.com: Sender is authorized to use 'sender@gmail.com' in 'mfrom' identity (mechanism 'include:_netblocks.google.com'...
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