Re: Reverse publish with isa2004?

2) You want to continue to receive emails at the provider but you want to
send all emails through your own mail server

option 2 i think .. but this setting should only effect my network users ,
not all clients over the world.

Well if you want to continue using the POP3 service from the provider for
message retrieval, yet redirect all SMTP sends to your internal mail server,
and you want to do this with minimal impact on your client configuration,
let me ask you this: how are the email programs configured on the client
workstations? Are you using the same hostname for both SMTP and POP3? Like
for example mail.mysite.com in both those fields. Because if you do, then
you won't be able to keep this config - one needs to be different from the
other, otherwise how will they point to two different servers?

You could for example continue to use something like mail.mysite.com for
POP3 and smtp.mysite.com for SMTP. However, as you correctly noticed
earlier, this would require creation of a "mysite.com" zone on your internal
DNS server(s) with an A record resolving smtp.mysite.com to the internal IP
of your mail server. The problem with that though, is that if you do this
your clients will not resolve the rest of the "mysite.com" records properly
(the records in the "Internet" domain hosted at your provider). This may be
or may not be an issue for you, just keep in mind that if you start using an
internal DNS zone like that all records in that zone required by your
clients will need to be there.

Alternatively what I would suggest is for you to ask the provider to create
a subdomain of your mysite.com, something like myregion.mysite.com, and put
an A record in there pointing to their mail server, I mean something like
smtp.myregion.mysite.com=194.102.22.114 (just an example, 194.102.22.114
would be the provider's mail server). Then you would also create a
myregion.mysite.com domain on your internal DNS server, and create the same
record pointing this time to your internal mail server:
smtp.myregion.mysite.com=192.168.2.11, for example.

Then you configure the email clients to use smtp.myregion.mycompany.com for
their SMTP settings. When the laptops are on the LAN that will resolve to
the internal IP, but when they're away that will resolve to the provider's
IP. This alternate approach has the advantage that you are not messing with
your "mysite.com" zone.

Hope this helps.
Virgil




.

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