>Q: Is it possible to have the Exchange users with addresses
>[EMAIL PROTECTED]

sure, we relay mail in/out for an Exchange server on the end of one 
of our leased lines.  An exchange account of [EMAIL PROTECTED] works fine.

>and still allow them to send mail to other regular imail (i.e. no-exchange)
>users i.e. to  [EMAIL PROTECTED]>

sure, it's the outlook client and its address books and mail account 
settings that handle all these issues, then the "internet connector" 
links internet style addresses to/from internet.  In the outlook 
address book, the user has to say that "someuser@domain" is delivered 
via "SMTP" as opposed to exchange's interior transports. SMTP goes 
out, surprise, via the Exchange internet connector.

>  i.e. does exchange have a smart-user/smart-relay setting?

the exchange-proprietary-msgs to Internet-SMTP "relaying" is done 
between the exchange server and its Internet connector.  The exchange 
user still has to indicate SMTP for Internet-bound mail addresses.

>I remember creating a domain, so that the exchange users were
>[EMAIL PROTECTED]  but this wasn't very satisfactory.

hmm, I'm a little confused. [EMAIL PROTECTED] can exist on either Imail 
or Exchange but not both.  Two mail servers can't both have the same 
set of [EMAIL PROTECTED]  Your "[EMAIL PROTECTED]" is the only 
way to have twol mail servers in the mydomain zone

mydomain.ie       MX 10     imail.mydomain.ie.
exch.mydomain.ie  MX 10     exch.mydomain.ie.

btw, "rewriting" rules and mail domain masqerading, not possible in 
Imail, are possible with postfix in IMGate, so that an IMGate mail 
hub would masquerade  all "internal" mail domains, ie, 
exch.mydomain.ie, would be "re-written" for the outside world as just 
mydomain.ie.

You still couldn't have, internally, an [EMAIL PROTECTED] on Imail 
and an [EMAIL PROTECTED] on exchange.  Since IMgate(postfix) 
wouldn't know what to do with "RCPT TO: [EMAIL PROTECTED]".

For incoming mail, you'd have to have postfix routing table that said

incoming mail for:    | is routed to:
======================|==========================
[EMAIL PROTECTED]  | [EMAIL PROTECTED]

>I've no problem going the other way since the small (exchange) group's mail
>can be forwarded.

>But I can't realistically do the same on Exchange (i.e set up and manage 600
>forwarding addresses)

I'm not clear why you are talking about forwarding.

Len


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