postfix container

Runs postfix container.

• https://mxtoolbox.com/domain/
• https://gmail.com/postmaster/
• https://serverfault.com/questions/419407/fighting-spam-what-can-i-do-as-an-email-administrator-domain-owner-or-user
• https://productforums.google.com/forum/#!msg/gmail/gcipz5Jg3zg/lrMCrt_kAQAJ
• https://support.google.com/mail/answer/81126?hl=en&vid=0-1510561403600-1544997826763

runit

runit - a UNIX init scheme with service supervision.

• http://kchard.github.io/runit-quickstart/
• http://smarden.org/runit/runsv.8.html
• http://smarden.org/runit/sv.8.html
• http://smarden.org/runit/chpst.8.html