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Just set your DNSBL list and threshold under Mail Proxy -> Options.

It will match upper and lower case subject (?i)(\W|^)(privated?|pains?|penis|pussy)(\W|$)

From the official documentation, it will bypass greylisting, SPF and DNSBL. No mention of rate limiting. https://pmg.proxmox.com/pmg-docs/pmg-admin-guide.html#_mail_proxy_configuration

@poetry, I believe you have already answer your own question. PMG use public DNSBL and spamassassin for spam detection and it provide you the freedom to customize the spam rate based on your own environment and experiences. As the email admin (I assume you are too), study the current spam mail...

Study your spam trend and create custom spamassassin uri rules. # Spammy link with email address uri LINK_W_MAIL /(\?|\#).*(@|%40)mydomain\.com\.my/i describe LINK_W_MAIL Spammy link with email address score LINK_W_MAIL 1.0 uri __G_DRV...

https://mxtoolbox.com/

IP 139.59.114.99 not listed in your DNSBL list, try using below DNSBL site. dnsbl-1.uceprotect.net rbl.dns-servicios.com sip.invalument.com hostkarma.junkemailfilter.com

then this should work. (?i)(\W|^)(foods|you want|fly|fake|fat|freedom)(\W|$)

Is your subject, "j.doe@example.com": "j doe You want this" ?

Try this what object, subject match field. Adjust the 25 character to the length you want. (?i)(\W|^)([\w.\-]{0,25}?example\.com)(\W|$)

Below is my DNSBL with threshold of 3. Use/setup internal DNS to prevent DNSBL timeout. zen.spamhaus.org*2,bl.mailspike.net,psbl.surriel.com,all.spamrats.com,dnsbl-1.uceprotect.net

Adding more DNSBL may cause false positive as not all DNSBL have the same reputation score. https://www.dnsbl.info/dnsbl-list.php

Use spamassassin custom rules to filter mail content. https://pmg.proxmox.com/pmg-docs/pmg-admin-guide.html#_custom_spamassassin_configuration https://cwiki.apache.org/confluence/display/SPAMASSASSIN/writingrules https://github.com/kawaiipantsu/spamassassin-rules/tree/master/rules

Set your domain MX IP to your PMG, PMG will accept all the incoming email and filter/delivery the mails to your actual email server. Assume you have setup correctly PMG with your email server.

Issue fixed with the latest update. proxmox-mailgateway: 7.1-1 pmg-api: 7.1-4 pmg-gui: 3.1-3 pve-kernel-helper: 7.2-6 pve-kernel-5.13: 7.1-9 pve-kernel-5.11: 7.0-10 pve-kernel-5.13.19-6-pve: 5.13.19-15 pve-kernel-5.13.19-5-pve: 5.13.19-13 pve-kernel-5.13.19-4-pve: 5.13.19-9...

I believe the current state of PMG do not support utf8 encoded subject. So it may not work. https://forum.proxmox.com/threads/utf-8-base-64-encoded-subject.110873/

What happen if you remove the icon? Does it work?

It will show as whitelisted under syslog Jul 07 12:13:22 pmg postfix/postscreen[91151]: WHITELISTED [218.208.xxx.xxx]:37062

Did you search under Mail Filter - Rules?

Try what object X-Sender match field rule.