It's a sad state of affairs.
Procmail is AWESOME but dead:
http://www.procmail.org/The newest way to filter email at the lda local delivery phase is to use a dovecot plugin called pigeonhole.
As a leach, I've been capturing dovecot mail list emails for years and I scanned over them reading about bugs. Dovecot developers say that Centos7 needs to have more up-to-date dovecot/pigeonhole packages to solve some common issues.
Centos seems to only have 2013 dovecot packages.
CWP unfortunately doesn't maintain a recent version of dovecot or pigeonhole (# yum list dovecot-pigeonhole dovecot*).
So.... I.... am..... humbled. procmail *is* installed and I could use that - which I'm WELL familiar with but I got to thinking about how invested CPW is in Centos yet they have old packages.
-Eric
PS. gosh procmail rules are SO compact, powerful and fast. This new pigeonhole (seive) syntax stuff is... <sign> ok I guess.