Exim4 handling redirecting mails from your apache vhost an external email

The Problem

Consider the Apache vhost myweb.com. Someone sends an email to
info@myweb.com. We want exim4 to spot that and use sendmail to send the mail to
the approved user. frequently that person might be sat behind gmail or something
similar.

The components

• Everything is done via exim4 config with the addition of a new router and
  vhost specific alias files which contain the email mappings.
  


• The text here assumes you have NOT split your configuration
  


• All exim configuration is done using the exim4.conf.template file.
  

The solution

• Edit /etc/exim4/exim4.conf.template.
  


• Modify the local domains definition
  
  
  
  

  # List of domains considered local for exim. Domains not listed here
  # need to be deliverable remotely.
  domainlist local_domains = @:localhost:dsearch;/etc/exim4/virtualhosts
  

  
  
  
  

This tells exim which domain names are considered for for further processing.

• Insert the following additional router code before system_alias handling (400):-
  
  
  
  

  #####################################################
  ### router/350_exim4-config_vdom_aliases
  #####################################################
  vdom_aliases:
  driver = redirect
  allow_defer
  allow_fail
  domains = dsearch;/etc/exim4/virtualhosts
  data = ${expand:${lookup{$local_part}lsearch*@{/etc/exim4/virtualhosts/$domain}}}
  retry_use_local_part
  pipe_transport = address_pipe
  file_transport = address_file
  no_more
  #####################################################
  ### end router/350_exim4-config_vdom_aliases
  ########################################################################################
  

  
  
  
  


• A cursory glance at the code suggests that /etc/exim4/virtualhosts will play a
  part. It does!
  


• Create a file for each vhost you wish to redirect email for. From our example
  we create /etc/exim4/virtualhosts/myweb.com. In it we place our email
  mappings. Here is an example:-
  

info: info@gmail.com
webmaster: webmaster@gmail.com

--
My Emacs Files At GitHub