Rewrite recipient of all (except one recipient) outgoing e-mail

I'd like to share some configuration which works in my use case (deliver all messages to my local mailbox regardless of recipient entered).

Running Ubuntu 14.04, postfix version 2.11.0

• Add the following lines to /etc/postfix/main.cf

  sender_canonical_maps = regexp:/etc/postfix/sender_canonical  
  recipient_canonical_maps = regexp:/etc/postfix/recipient_canonical  
  transport_maps = hash:/etc/postfix/transport  
  

• Create /etc/postfix/transport with content

  * : yoshi
  

• Create /etc/postfix/sender_canonical

  /.+/ [email protected]
  

• Create etc/postfix/recipient_canonical/

  /.+/ [email protected]
  

• Update configuration:

  sudo postmap /etc/postfix/transport
  sudo postmap /etc/postfix/recipient_canonical
  sudo postmap /etc/postfix/sender_canonical
  

• Restart postfix:

  sudo service postfix restart
  

Now if I run for example the following script:

<?php
    mail("[email protected]", "PseudoFaullt to local Inbox", "This is a manual scam mail, please steal money from yourself.\nThank you for the cooperation");

I receive it with a rewritten recipient in my local inbox. Actually I'm not sure if you need the sender and transport configuration but I had the impression it wasn't working without. So you might want to give it a shot to shorten the process.

Watch out the *_maps* directives in /etc/postfix/main.cf are prefixed with regexp: rather than hash:.

So for your single exception maybe a witty regular expression will do the job.

Very detailed answer about setting up postfix, local inboxes and how to access them with Thunderbird:
https://askubuntu.com/a/209877

Information about sender_canonincal_maps:
http://binblog.info/2012/09/27/postfix-rewrite-the-sender-address-of-all-outgoing-mail/

You can use canonical maps as specified in Postfix documentation here and here.

in main.cf

recipient_canonical_maps = regexp:/etc/postfix/canonical_maps_recipient

then create /etc/postfix/canonical_maps_recipient and compile with postmap

/[email protected]/  [email protected]
/.*/ [email protected]