[Exim] saslauthd - I love it!

I just came across saslauthd and the Exim hook into it and I love it.
What it does is it does smtp authentication against IMAP by trying to
log into IMAP. Thus - anyone who has an IMAP login will have the same
user and password for SMTP AUTH login.

I'm just posting this here for anyone else like me who didn't know you
could do this. The how to is in the Exim docs.