On Tue, Jan 11, 2022 at 04:10:58PM +0100, Joachim Lindenberg 
<postfix-us...@lindenberg.one> wrote:

> Hello Levi,
> In my experience the best spam protection is a custom domain with an email 
> server supporting gray-listing (postfix does). I receive almost no spam on my 
> own domain but plenty on addresses hosted by public email providers like 
> live.com (despite the rigorous black listing of outlook.com).
> W.r.t. virus filtering I prefer to bet on user education rather than any tool.
> Regards, Joachim
> 
> -----Ursprüngliche Nachricht-----
> Von: owner-postfix-us...@postfix.org <owner-postfix-us...@postfix.org> Im 
> Auftrag von Levente Birta
> Gesendet: Tuesday, 11 January 2022 13:34
> An: postfix-users@postfix.org
> Betreff: OT: comercial spam filterin
> 
> Hi
> 
> My apologies for the off topic.
> 
> I would like to ask the users here if someone using a commercial spam
> and/or virus filtering with postfix and which one?
> 
> Thanks
> Levi

Hi,

Most people are probably using free software rather
than commercial. e.g., amavis, spamassassin, postgrey,
rspamd, postfix's builtin postscreen. I use amavis,
spamassassin, postgrey, and my own procmail monster.
People say good things about rspamd. I also use
OpenDKIM and OpenDMARC, but only to add headers.
Postscreen in Postfix probably does everything that
postgrey does and more. RBLs are also a thing but some
of them can block a lot of solicited commercial email
as well as unsolicited commercial email.

Sorry if you already knew all that, and only wanted
information about commercial software.

cheers,
raf

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