Jacques Marneweck's Blog

One gotcha when using exim to do authenticated SMTP one wonders why you keep seeing the following:

Return-path: <"email@add.re.ss"@server.host.name>
*snipped*
Sender: "email@add.re.ss"@server.host.name
*snipped*

One needs to modify your acl for acl_check_rcpt for authenticated SMTP connections to contain the sender_retain bit like below:

  accept  authenticated = *
          control       = submission/sender_retain

Restart your exim (in my case on FreeBSD I used /usr/local/etc/rc.d/exim restart) and send a email:

Return-path: <email@add.re.ss>
*snipped*
Sender: email@add.re.ss
*snipped*

Posted by Jacques Marneweck at 2:35 PM | Permalink | Comments (0) | TrackBacks (0)

I've been running exim mail servers for years now and needed to boost performance for running various high volume distribution lists for a client.

One of the things about the old exim 3 system was that it ran fast and I could peek over 350KKit/s outgoing traffic on a 384KBit/s leased-line circuit. So I've spent some time today tweaking exim 4 on one of the servers which handles the outgoing SMTP traffic from the mailing list software, to see how I could speed up outgoing mail delivery times considering that I have a 100Mbit/s uplink.

So I'm most likely going to need to tweak over the next couple of days to get the best performance out of exim and take note of what I tweaked. Sounds like fun.

Posted by Jacques Marneweck at 8:30 PM | Permalink