Date: Sun, 22 Jul 2001 13:31:03 -0400 From: John Capo <jc@irbs.com> To: freebsd-isp@FreeBSD.org Subject: Re: IMAP servers Message-ID: <20010722133103.A7059@tortugas.irbs.com> In-Reply-To: <3B5AED0F.F8CE7C64@buckhorn.net>; from bob@buckhorn.net on Sun, Jul 22, 2001 at 10:11:11AM -0500 References: <3B5AED0F.F8CE7C64@buckhorn.net>
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Last week I switched from postfix/procmail delivering to Maildirs
for virtual domains to postfix/procmail/cyrus. Virtual domains
are easy to implement with postfix and cyrus.
I let postfix map user@domain.com to imap+user_domain_com with a
mysql table and virtual_maps=mysql:/blahblahblah. Procmail is the
mailbox_command delivery agent. I created a fallback_transport to
procmail via the pipe driver:
procmail unix - n n - - pipe
flags=R user=cyrus argv=/usr/local/bin/procmail USER=${user} EXTENSION=${extension}
Users in /etc/passwd have their mail delivered by the mailbox_command,
in my case procmail, and everything goes to procmail/cyrus via the
fallback_transport.
I use procmail because it was the easy to implement junkmail
filtering and attachment filename munging to disable the sircam
worm and friends. The fallback_transport could be directly to
cyrus or to cyrus via some other filter. The mailbox_command could
be something other than procmail.
A minimal ~cyrus/.procmailrc:
DELIVERMAIL="/usr/local/cyrus/bin/deliver"
:0
| $DELIVERMAIL $EXTENSION
I modified lib/auth_unix.c to map '@', '%', and '.' in usernames
to '_' since '.' is the mailbox seperator in cyrus. This lets me
assign unique usernames/mailboxes like joe@domain.com, joe@otherdomain.com,
joe@yadomain.com, and so on.
Netscape POP does not permit user@domain.com style usernames.
Netscape turns user@domain.com to user@domain.com@popserver.com so
I tell Netscape POP users to use user%domain.com instead.
user@domain.com does work for Netscape IMAP and Outlook POP.
Bottom line is if you let postfix do the virtual domain to mailbox
name mapping, and you don't need user@domain.com style usernames,
cyrus works out of the box.
John Capo
IRBS Engineering, Inc.
Quoting Bob Martin (bob@buckhorn.net):
> I've decided that it's time to re-invent our e-mail system. Sendmail has
> already been replaced by postfix. Now it's time to deal with IMAP.
>
> What I need is an IMAP server that handles virtual domains, "virtual"
> (non system) users, and that can handle different imap name spaces. SASL
> authentication is also a must, as is a very low price tag. Scalability
> and performance would be nice, but at the moment, it's not essential.
>
> I've narrowed it down to 2 servers.
> Cyrus. Does everything but virtual domains.
> Courier. Does everything but user defined name spaces.
>
> As it stands now, I'm going to "fix" one of the two. Question is, which
> one?
>
> I really have 2 questions. 1) Is there another well developed IMAP
> server I should look at? 2) If you are using one of these 2, what are
> it's good and bad points.
>
> If you'll reply to me off list, I'll summarize and post the summary back
> to the list.
>
> Thanks for the help!
> Bob Martin
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