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    junk 100%

    Set rule to quarantine all junk mail. then you can investigate it at the quarantine section.
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    Sender IP listed in many blacklist but email was still accepted

    Provide the log about the spam mail pass through your PMG.
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    Non valid RBL rejections

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

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

    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...
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    limit the number and block origin

    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
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    [TUTORIAL] Mail filter example

    Try this. What object regex from=^mindinsole.*<.*>.*$
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    [TUTORIAL] Mail filter example

    @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|$)
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    [TUTORIAL] Mail filter example

    Pls provide the spam mail raw format for checking.
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    [TUTORIAL] Mail filter example

    Try something like this. Remember who object refer to Return-Path: header in the mail. Make sure the filter match it.
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    DNSBL not working

    What is the spam mail IP?
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    How did that one manage to get passed the SPAM filters?!

    And also setup mail filter to filter spam mail. https://forum.proxmox.com/threads/mail-filter-example.71904/
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    How to set accepted emails to quarantine

    That is only the filter, choose block or quarantine action base on your requirement.
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    How to set accepted emails to quarantine

    Check out tutorial on customize the mail filter. https://forum.proxmox.com/threads/mail-filter-example.71904/
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    cleaning emails affected by spam score 10

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

    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...
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    DNSBL Resolution Issues

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

    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
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    [SOLVED] Mail Proxy Whitelist Regex

    Try this regex (\W|^).*\.mil(\W|$) (\W|^).*mail\.mil(\W|$)
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    Can I create a rule based on a text in the mail?

    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
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