Description of problem: Would it be possible to have dovecot pigeonhole in the epel repository? Additional info: RHEL 8/CentOS 8 drop dovecot-pieonhole support from dovecot package. But sieve filters is important part of dovecot imap server. So will be possible to have this in EPEL 8?
Sorry, no, EPEL doesn't override any RHEL packages... you will need to open a new bug on dovecot in rhel8 and ask them to re-add it.