Sendmail – Masquerading And Relaying

Ah! The joys of Sendmail cf configuration. How arcane can the following get?

R$+ $@ $>93 $1

That line tells Sendmail to masquerade the headers of an email as another domain. Luckily I just generated another sendmail.cf with my install-sendmail script and did a vimdiff of both files. Comments are helpful too, and takes some of the bite out of the .cf file.

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