CentOS - Sep 2019 - Replacing sendmail with postfix (was: deprecations leading up to C8)

Once upon a time, Kenneth Porter <shiva at sewingwitch.com>
said:
> How would you implement the section here titled "Sendmail
> workaround" using Postfix?
http://www.postfix.org/postconf.5.html#recipient_delimiter

-- 
Chris Adams <linux at cmadams.net>

--On Friday, September 20, 2019 2:06 PM -0500 Chris Adams 
<linux at cmadams.net> wrote:
>> How would you implement the section here titled "Sendmail
>> workaround" using Postfix?
>
> http://www.postfix.org/postconf.5.html#recipient_delimiter
Perfect. I think the only other significant customizations I have are lines 
to use the MIMEDefang and OpenDKIM milters. When last I looked into 
migrating, I recall that Postfix handled milters just fine.

Meanwhile, I'd considered replacing procmail with the Dovecot delivery 
program to get access to Sieve filtering but didn't see how to easily 
invoke SpamAssassin as I do now in /etc/procmailrc. Is Procmail still the 
default delivery agent in RHEL8?

Once upon a time, Kenneth Porter <shiva at sewingwitch.com>
said:
> Perfect. I think the only other significant customizations I have
> are lines to use the MIMEDefang and OpenDKIM milters. When last I
> looked into migrating, I recall that Postfix handled milters just
> fine.
Milters work a little different under postfix IIRC... I haven't tried
them (which is a little sad, since I think I may have been the first
person to write a sendmail milter :) ).
> Meanwhile, I'd considered replacing procmail with the Dovecot
> delivery program to get access to Sieve filtering but didn't see how
> to easily invoke SpamAssassin as I do now in /etc/procmailrc. Is
> Procmail still the default delivery agent in RHEL8?
Postfix can use lmtp or procmail (I don't remember which is default).
IIRC sieve may not provide external scripting for security reasons.

I use spamassassin via amavisd-new, with messages going postfix ->
amavisd -> second postfix (all via SMTP).  It's more complicated, and
not really necessary for the small setup (but I run larger mail servers
with that setup, so I do the same for my personal servers as well).
-- 
Chris Adams <linux at cmadams.net>