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Why rspamd? rspamd is somehow the same as PMG (just - for me - not such as good as a customized PMG). Postfix is fine, Dovecot is fine as well. If you're using webmail, maybe you should consider to use sieve for learning ham and spam on user actions by moving mails to spam folder or vice versa...

Subscribe to the developers mailing list and contribute your code there. I believe, they will be able to help out. Also try not to manipulate but add a wrapper, which should be the latest update, so any antivirus software can be called. Then this change will also be update safe.

I currently try dnsbl.beetjevreemd.nl, which looks fine, if it works. On one system it works well, on the other, I'm unable to get use of, I always get SERVFAIL also on the test address 127.0.0.2 (or for sure to be used in reverse order). I also try black.dnsbl.brukalai.lt and...

I remember, I had both on my list too, but F-Secure I mean to remember was also expensive and Eset was one of the solutions, which looked fine, but not official supported any more, you just can find "old" deep links. Dr.Web only looked to be affordable, demonized and still supported, however, I...

Be careful with SPF, if like to use and set it, you are required not forget about it. Otherwise, your mails may be rejected.

I'm not sure, but I believe, on our roadmap there is development of a WHCMS plugin for our business on ssl certificates. If you ask someone to code a PMG WHMCS plugin for you, I then may be able to refer you to a developer based on our experience. For sure, a PMG WHMCS plugin is not available...

Seems to be just the same suggestion as others and would also well integrate, as that would help out for some issues as well would provide better anti spam quality by allowing better learning of ham and spam via e.g. GUI actions on the "archive backend" (moving to spam or ham on user action).

Check the documentation you can integrate any antivirus solution via modifications via shell. However, where are just a few ones, which really makes sense. ClamAV is free, but worse detection. Avast is fine on detection and affordable. Dr.Web may be the only solution, which is demonized, still...

Best would be to create a feature request in bug tracker and post the link here, I would then vote on that too.

I believe, Proxmox team need to verify, but I believe, the count above (first screenshot) contains all rejects from mail.log/syslog (e.g. also hangups from postscreen, TLS error rejects (I verified both and can't find any in the tracking center), mostly because they also lack of information, on...

As many know, I don't use and like Quarantine, however, as it's an option on PMG, it would be fine, if Quarantine could be used to learn Bayes filter. So if a quarantined message is released, should be (allowed, maybe adjustable or extra option) to learn that as ham and if a quarantined message...

Junk mails are such one, which postfix rejects. However, I also recognized, that you don't see all postfix rejects in tracking center. E.g. retries, wich post screen directly rejects don't show up in the tracking center.

Über die Plesk Firewall aktivieren, daß Port 25 (und ggf. 465) nur noch über die IP des PMG erreichbar ist, so habe ich das bei mir gemacht. Ausgehend sendende User sollen Port 587 verwenden.

bl.worst.nosolicitado.org got hits now but false-positive, also spam.pedantic.org is 50:50 spam and no spam, dnsblchile.org as well has much false positives. So nothing new.

e.g. https://spamassassin.apache.org/full/3.1.x/doc/sa-learn.html

train spamassassin via shell by storing minimum your spam and maybe also your ham in extra mailboxes and read them on PMG via sa-learn. Ham is fine, but not highly necessary as spamassassin tries to auto-learn ham and it does the job really good. But spamassassin is very conservative in learning...

New try with bl.nosolicitado.org and bl.worst.nosolicitado.org I already removed bl.nosolicitado.org because of too many false-positives (for sure, ESPs and newsletters may be considered as bulk, but if ordered or legal subscribed, they should also not be suppressed), will continue with...

Use sa-learn via shell to train SpamAssassin for ham and spam.

You're welcome to improve the documentation. It's finally an open source product right now, so users should be aware of what they do or should purchase a subscription to get support. The getting started tutorials and videos are good enough to start with, however, as mentioned earlier, feel free...

Just give it a try and also consider to adjust it a bit with my Advancing PMG thread.