RE: [Sheflug] Internal mail server complications

["Morris, David (Allvac, UK)" <david [at] xxxxxxxxxxxx>]

[snip]

Only one 's' in Vasey...

Apparently, Royston Vasey is Chubby Brown's real name...


> > Could this be set so that some internal emails still get 
> posted to the ISPs
> > POP3 server.  We have some mobile/part time workers who 
> collect their email
> > from our ISPs web based email service when they are not in 
> the office.
> > Other workers are in the office all the time and its their 
> email I want to
> > prevent from going outside our LAN.
> 
> 
> Possibly; the easiest thing to do would be have mails be 
> forwarded for 
> those users to the ISP. So the mail is /still/ delivered 
> locally, however 
> using .forward / .qmail / <insert other mapping techniques 
> here>, the mail 
> is then forwarded to the ISP. This would mean having at least 
> two domains
> though; one for your mail server (wibble.net) and then 
> whatever your ISP
> has (myisp.com) just so you can forward. External users need 
> only need know 
> about the "wibble.net" domain, but if both can be treated as 
> one and the 
> same by the ISP then there are no problems.

...or you could do something using the pop3 mailbox collection that some ISPs offer where you collect mail from specific nominated mailboxes on an account by seperating the account name and the mailbox wth '+' like david+webmaster [at] davidm.demon.co.uk or similar.

Depending on numbers, what you could do then is arrange to collect mail using fetchmail by POP3 from your ISP and set up specific fetchmail bits for the users where you wanted mail on the local server and leave everything else.

If you were sending mail using (.forward | .qmail | .courier) back to the ISP, depending on the domain configuration, you may find yourself with mail loops if myisp.com sees an MX record for wibble.net and tries to re-forward the mail to mail.wibble.net which then forwards it to myisp.com ? Why not use a complete 'out of the box' solution and provide your own webmail instead of using the ISPs? It would mean you could integrate things like address books and provide a full solution for all your users whether in the office or not. Courier is one alternative. You get SMTP, IMAP, POP3, webmail and a few other goodies in one package. There are other ways of achieving the same.

-- 
David
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