It's got to be Sendmail.
Yes, it is Sendmail.
The file is actually /etc/mail/virtusertable ("virt", not "virtual").
Correct. Sorry for the typo.
/etc/aliases is system-wide across all domains on the left side, which virtusertable can have full email addresses in different domains on the left side. But virtusertable can't do pipes on the right side IIRC.
That makes sense. So to restate then, the difference between the two is that…
1. entries in /etc/aliases will apply to all domains on the system since the entry on the left is just a username (and not a complete email address), whereas entries in /etc/mail/virtusertable are complete email address 2. you can direct the mail sent into a script via a pipe in /etc/aliases …correct?
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