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Postings by Thomas Nyberg

How to autoreply with "Undelivered Mail Returned to Sender" unknown user for user+doesnotexist@domain.org

Hello,

Let's say that I do have a user "user" on my system, but I would like
for emails sent to "user+ ... at domain dot org" to bounce back the
"Undelivered mail" message with something like:

<user+ ... at domain dot org>: unknown user: "user+doesnotexist"

How would I do this? I naively tried adding

user+doesnotexist: doesnoteixst

to my /etc/aliases file, but it was still delivered to my user account.

Thanks for any help.

Cheers,
Thomas