Source code: https://github.com/za3k/devops
             https://blog.za3k.com/tag/email/
Snapshotted daily to burn.za3k.com

      hostname:port   public access? service
  smtp.za3k.com:25    YES            SMTP, email
  smtp.za3k.com:587 
  imap.za3k.com:143   NO             IMAP, email
  imap.za3k.com:4190  NO             ManageSieve, email
   znc.za3k.com:10000 NO             ZNC, irc bouncer