[CentOS] Replacing sendmail with postfix (was: deprecations leading up to C8)

--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?