Great Circle Associates Firewalls
(May 1994)
 

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Subject: IMAP and a firewall
From: torq @ aleph1 . co . uk (Andy Mell)
Organization: Home, Cambridge, UK.
Date: Sun, 8 May 1994 02:06:08 GMT
To: Firewalls @ GreatCircle . COM
References: <199405070800 . BAA17118 @ mycroft . GreatCircle . COM>
Reply-to: torq @ aleph1 . co . uk

I've got a problem. (What else)

At my site we have a mail hub which serves IMAP to all local clients,
this is on the main campus network.

Now, my network has about 40 machines (not unix or dos), and a firewall
box sits between the local network and the campus network.

I have been told that I am not permitted to run sendmail on the firewall
box and that this is site policy - restricting incoming mail delivery
to main mail hub servers only.

Is there any way I can get IMAP clients on my network to get mail
to and from the mail hub IMAP server through the firewall? given that
there is only one real IP address available, and that is used for the
firewall box.

I have thought of three possible solutions. An IMAP server on the
firewall which serves my network, then run the imapmove program which
copies the inbox on the mail hub if theres anything in it to the
firewall at regular intervals using cron. a two stage process and
a little nasty.

The second solution is for people to telnet to the firewall and then
run pine there. I'd rather not, as my IMAP client program (!feMail) is
streets ahead of pine.

The other is some way of getting IMAP clients on my network to connect
to the mail hub through the firewall - presenting a single IP address
to the mail hub but the clients are binaries and I cannot recompile them.

Appreciate any comments or any other ideas people might have?

Andy

--
E-mail:         torq @
 aleph1 .
 co .
 uk

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