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Show the content of /etc/pmg/pmg.conf and /etc/pmg/templates/main.cf.in (if available). Do you customize your main.cf?

Try what object regex (\W|^)[\w.+\-]{0,50}@[\w.+\-]{0,50}\.buzz(\W|$)

Try what object -> match filename (?i)(\W|^)(SG.*\.(zip))(\W|$). For spamassassin custom rule, follow the official guide (https://pmg.proxmox.com/pmg-docs/pmg-admin-guide.html#_custom_spamassassin_configuration). Here are some custom rules...

Try customize incoming rate limit or use postfwd https://www.cyberciti.biz/faq/postfix-limit-incoming-or-receiving-email-rate/ http://postfwd.org/ratelimits.html

Try this. What object regex from=^mindinsole.*<.*>.*$

@Drax, you can opt for below few mail filter option based on the spam mail header. Who object (refer to Return-Path:) - Email: info@adoptionpatent.co - Domain: adoptionpatent.co What object (subject) - subject=(?i)(\W|^)(hope|pain|hidden secrets)(\W|$)

Pls provide the spam mail raw format for checking.

Try something like this. Remember who object refer to Return-Path: header in the mail. Make sure the filter match it.

What is the spam mail IP?

And also setup mail filter to filter spam mail. https://forum.proxmox.com/threads/mail-filter-example.71904/

That is only the filter, choose block or quarantine action base on your requirement.

Check out tutorial on customize the mail filter. https://forum.proxmox.com/threads/mail-filter-example.71904/

What do you mean by clean? If the email is blocked, it will not get delivered to your mail server or PMG.

Maybe you can try all.spamrats.com as it contain all of it lists. https://spamrats.com/lists.php Apr 16 07:42:48 pmg postfix/dnsblog[26701]: addr 107.174.142.77 listed by domain bl.mailspike.net as 127.0.0.11 Apr 16 07:42:48 pmg postfix/dnsblog[26702]: addr 107.174.142.77 listed by domain...

Maybe replace the spamrats.com with others DNSBL since there are many alternative.

Using zen.spamhaus.org*2,bl.mailspike.net,psbl.surriel.com,noptr.spamrats.com also having timeout with the spamrats DNSBL. Maybe is their problem. Apr 15 09:09:36 pmg postfix/postscreen[2782]: warning: dnsblog reply timeout 10s for noptr.spamrats.com

Try this regex (\W|^).*\.mil(\W|$) (\W|^).*mail\.mil(\W|$)

As far as I know there is no option to customize spamassain rule via GUI. Maybe you can request new feature to PMG's Dev. Refer below link. https://pmg.proxmox.com/pmg-docs/pmg-admin-guide.html#_custom_spamassassin_configuration

Use spamassasin custom config. body CLICK_BAIT /\bclick here\b/i describe CLICK_BAIT Possible click bait score CLICK_BAIT 1.0

Is up to your environment. If your PMG is same network with your email server, configure firewall to redirect SMTP to your PMG instead of the email server.