How to run a command after receiving a mail with exim4?

Question

Where can I tell exim to run a shell/php command everytime a new mail has been delivered to a virtual mailbox. It does not matter to which user the mail is delivered?

Answer 1

You want to look at shadow_transport.

For local deliveries (only), if delivery succeeds and the Transport references another Transport in its shadow_transport option, then that second transport will also be invoked.

You'd then have that second Transport be a driver = pipe transport.

Eg:

maildir_delivery:
  driver = appendfile
  directory = ...blah blah whatever ...
  maildir_format
  # various other maildir extension options if needed
  shadow_transport = audit_delivery

audit_delivery:
  driver = pipe
  command = /some/path/to/some/command with some options
  user = audituser
  group = mail

Answer 2

Given that you apparently have a real user to deliver to, you probably want to look into using a .forward file, or possibly procmail if you want to get a bit fancier (such as if you only want to run the command for a subset of messages delivered to the user).

Answer 3

The easyes way I found was creating a new router afterwards delivering to the local users containing: runscript: driver = accept transport = run_script unseen no_expn no_verify

so, the mail is still handeld the way it should be and my script is run, with the right transport f.e.: run_script: debug_print = "T: run_script for $local_part@$domain" driver = pipe path = "" command = ""