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PostSRSd integration with Exim

SRS Return router

If using a domain solely for SRS return addresses:

SRS_DOMAIN = srs.your.domain

begin routers

srs_return:
  caseful_local_part
  domains = SRS_DOMAIN
  driver = redirect
  allow_fail
  data = ${if match {$local_part}{\N(?i)^srs[01]=\N} \
	{${if match \
	  {${readsocket{inet:localhost:10002}{get ${quote_local_part:$local_part_prefix$local_part}@$domain}{3s}}} \
	  {\N^200 (.+)\N} \
	  {$1} \
	  {:fail: Invalid SRS bounce} \
	}} \
	{:fail: Invalid SRS bounce} \
  }
  no_more

If your SRS domain is also used for other addresses:

SRS_DOMAIN = srs.your.domain

begin routers

srs_return:
  caseful_local_part
  domains = SRS_DOMAIN
  local_part_prefix = srs0= : srs1=
  driver = redirect
  allow_fail
  data = ${if match \
    {${readsocket{inet:localhost:10002}{get ${quote_local_part:$local_part_prefix$local_part}@$domain}{3s}}} \
    {\N^200 (.+)\N} \
    {$1} \
    {:fail: Invalid SRS bounce} \
  }

Rewriting outgoing mail in the SMTP transport

The following excludes locally submitted mail, or mail submitted by authenticated users from SRS rewriting. Of course, if the sender address is already in one of our local domains, there is no need to rewrite the address. You may need to remove *@+virtual_domains from the list if you do not use them.

begin transports

remote_smtp:
  debug_print = "T: remote_smtp for $local_part@$domain"
  driver = smtp
  return_path = \
    ${if and{\
              {!match_ip{$sender_host_address}{:@[]}}\
              {!def:authenticated_id}\
              {!match_address{$sender_address}{*@+local_domains:*@+virtual_domains:SRS_DOMAIN}}\
            }{${if match \
              {${readsocket{inet:localhost:10001}{get $sender_address}{3s}}}\
              {\N^200 (.+)\N}\
              {$1}\
              fail}\
            }\
     fail}

In your router you're likely to know when you're forwarding an email. When you check a ldap for a forwarding address for example. If that's the case you can set this in your router

   address_data = "enable-forward=true"

And add this config in 30_exim4-config_remote_smtp if you use Debian split config for example

return_path = \
${if and{\
          {bool{${extract{enable-forward}{$address_data}}}}\
          {!match_address{$sender_address}{*@+local_domains:*@+virtual_domains:SRS_DOMAIN}}\
        }{${if match \
          {${readsocket{inet:localhost:10001}{get $sender_address}{3s}}}\
          {\N^200 (.+)\N}\
          {$1}\
          fail}\
        }\
 fail}