Re: [Fail2ban-users] Drop Established Connection on Ban

[Arturo 'B. B. <bu...@bu...>]

As a long time mail server admin, I can confirm postfix is amazing, and has
a wonderful ecosystem of tools to enhance different aspects. Other
alternatives could be Courier-MTA by Sam Varshavshik, but the Postfix
community is way more positive.


On Mon, May 3, 2021 at 11:53 AM Kenneth Porter <sh...@se...>
wrote:

> --On Monday, May 03, 2021 2:05 PM +0100 Darac Marjal
> <mai...@da...> wrote:
>
> > If sendmail can't do that (I'm struggling to find
> > decent documentation for it), consider replacing sendmail with exim or
> > postfix - both of which DO have this capability.
>
> I learned sendmail using the "bat book" from O'Reilly. (Popular publisher
> of books on open source systems, with each book characterized by a notable
> animal on the cover.)
>
> <https://www.oreilly.com/library/view/sendmail-4th-edition/9780596510299/>
>
> Alas, the online documentation got much harder to find when sendmail went
> commercial. Some FAQs here:
>
> <https://www.proofpoint.com/us/sendmail/faq>
>
> Alas, sendmail was written at a time when the Internet was more trusting
> and when software was less integrated, so authentication was bolted on as
> an extra feature. I haven't found anything on rate-limiting it except as
> an
> anti-spam measure.
>
> Note that Red Hat distros switched to Postfix as the default mail server a
> couple versions back but still provide sendmail as an alternative. So a
> recent Fedora or CentOS system will likely be running Postfix.
>
>
>
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