Linux – How to sendmail via command line piping

In the routers section of your exim config, you'll have a router that looks something like this:

 lookuphost:
    driver = lookuphost
    transport = remote_smtp

This is what tells exim to deliver mail directly. You need to tell it to use the smarthost instead.

Replace the above router with something like this:

 smarthost:
   driver = manualroute
   domains= ! +local_domains
   transport = remote_smtp 
   route_list = *  smtp.ultrahosting.com  byname
   host_find_failed = defer
   no_more

Make sure that the transport name in the new router is the same as in the original (remote_smtp in this example).

Also, you'll need to restart exim after making these changes.

You have to modify ruleset 0 (or ruleset 2) to work this out:

LOCAL_RULE_0
R$* < @ virtualdomain.com. > $*     $#prog $: $1 @ virtualdomain.com

The prog delivery agent is discussed at page 727 of the "bat book" (4th edition).

The above does not work with smrsh. It makes the assumption that $#prog is set to a program that decides what actions to take based on its argument.

You can even define your own delivery agent which will do exactly what you want, instead of trying to fit what is available to your case.