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I want to set up catch-all email on a domain, but also retain the ability to except certain email accounts, such that, if an email is sent to an excepted account, it is bounced back with an "account does not exist" error. What are my options for making this happen? Remotely hosted or self-hosted solutions are fine. Linux-based solutions are preferred in case of self-hosting.

user294732
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2 Answers2

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sendmail with the following virtusertable entries will do this:

fred@example.com                fred
bounce@example.com              error:nouser 550 User unknown   
@example.com                    user294732
MadHatter
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You could accomplish this using Postfix's PCRE tables. Configure it with postconf:

postconf -e "virtual_alias_maps=pcre:/etc/postfix/virtusertable"

And an e.g. /etc/postfix/virtusertable would look like this:

/^alex@example\.com$/                alex
/^barry@example\.com$/               barry
/(?<!^corey|dave)@example\.com$/     catch-all

Using this, alex and barry aliases will get delivered, corey and dave will get rejected and everything else will get routed to catch-all.

Belmin Fernandez
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  • This needs the package `postfix-pcre` on ubuntu. Otherwise there will be errors! – Zulan Oct 03 '15 at 19:26
  • There is an extensive discussion about this here: http://www.linuxquestions.org/questions/linux-server-73/postfix-how-to-reject-incoming-mail-as-in-sendmail's-error-nouser-671883/ - if/endif can be an alternative to the scracy `?<!` regex. – Zulan Oct 05 '15 at 17:10