[K12OSN] Proxy for Email and other apps not proxied by squid

[Les Mikesell]

On Tue, 2004-06-15 at 07:09, Sean Fichera wrote:
> I need a simple Brain Dead solution to get outook clients on Windows workstations to work with a Linux Server.  I don't want to deal with sendmail or similar programs.  There are too many people with different ISP's that need to check their mail and I don't want to manage another mail server.  All I want is a simple proxy for the mail and AOL Instant Messenger and some Special Ed programs that use telnet. I need little configuration in case the server needs to be rebuilt in the middle of the school year. I can't stress enough I need SIMPLE! Any help with any of these problems would be much appreciated.

If you just NAT and allow port 110 out through your firewall your users
can connect to their ISP's POP server.  Likewise port 143 for IMAP and
ports 995 and 993 for the SSL versions.  That lets people download/read
their mail.  A default k12ltsp install should allow this unless you
have additional firewalling that blocks outbound connections.  However
most ISP mailers will only accept SMTP mail from their own address
ranges so your users will not be able to send mail without some local
support.  Some may allow authenticated access with the same
login/password as for pop (and most current user agents support this)
or they may provide a web mailer.   If that isn't enough, you'll have
to run sendmail, postfix, or qmail configured to only accept from your
local network address range and forward outbound. This is not difficult
and your worries about rebuilding the server can be covered by simply
keeping a backup of the configuration file(s) on some other machine.

---
  Les Mikesell
   les at futuresource.com