Many Mail Domains, One Machine: The Forwarding Mailer
Hal R. Pomeranz · USENIX Large Installation Systems Administration Conference · 1996
With the explosion of domain registration in the last 18 months, many organizations find themselves having to maintain multiple separate email domains. Existing solutions for this problem are capital- or administrator-intensive. Here we explore a simple solution that allows an organization to support arbitrarily many separate domain spaces on a single host machine with only a single Sendmail server. This system has been used in production at the author's organization since 1994 with great success.