MFH: r538237

mail/vrfy: unexpire by moving to submitters GitHub

Add manual page, bump PORTREVISION

While here add TIMESTAMP to distinfo and reorder Makefile variables a bit

PR: 245488
Submitted by: Aleksandr Ignatyev <alex@i.org.ua>
Approved by: maintainer timeout (jadawin, 2 months)

Approved by: ports-secteam (joneum)