I have an FC3 mailserver/webserver machine that I am trying to set up so that users of various web/mail domains on the machine can send and receive email through their preferred MUA (Outlook/Evolution/etc). The machine has the latest Sendmail and Dovecot running, with Squirrelmail supplying access to email for all domains, sending and receiving properly because it is on the machine itself.
The problem comes when a remote machine or webmail wants to send to another remote machine, say me@xxxxxxxxxxxx on a remote Outlook to me@xxxxxxxxx, which is "remote relaying". I would use the pop-before-smtp option that all MUAs now use for authentication.
http://www.sendmail.org/~ca/email/roaming.html#POPB4SMTP is the best advice I can turn up so far but it seems to be conflicting opinions and incomprehensible to anyone but Sendmail gurus.
Since pop-before smtp through Sendmail is very common out there - there must be someone who knows how to make it work step-by-step, or an idiot's guide on how to do it. I understand the reasons for distros to enable Sendmail in a mode that locks out spammers but there must be a secure _working_ mode as well that even a relative newbie can set up and still be secure(?)
My personal preference is to use SMTP AUTH rather than POP-before-SMTP, and to set it up on port 587 (MSA).
I don't know of a *really* good guide for setting this up, but some starters might be:
http://www.madboa.com/geek/sendmail-auth/ http://www.joreybump.com/code/howto/smtpauth.html http://www.simpaticus.com/linux/sendmail-smtp-auth-howto.php
Cheers, Paul.
