SSMTP

HOWTO: Create Aliases
The software SSMTP does not use the traditional file /etc/mail/aliases, but instead uses entries in the file /etc/mailrc.

set ask askcc append dot save crt ignore Received Message-Id Resent-Message-Id Status Mail-From Return-Path Via Delivered-To alias itsupport user@domain1.com,joe.smith@domain2.co.uk,joebloggs@domain3.com