Re: Setting up a subdomain for outbound email

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@fax.domainname.com. I know I need to add a new MX record to our
internal DNS and point it to FAXSERVER.domainname.com.

Yes.

I just don't know how to setup IIS to do all of this.

If the fax server vendor plugs into IIS SMTP (in order to grab
messages submitted via SMTP and shunt them off into another
application), there should be nothing you need to do but ensure that
[a] Exchange sends messages to *@fax.example.com to your fax server,
and [b] the fax server will accept those messages from your Exchange
server destined for fax.example.com.

[a]... may be accomplished, as you suggest, using DNS.

[b]... by default, IIS SMTP will accept messages only to its Default
(Local) Domain and put those messages in \Drop. All other domains will
not accepted for relay (unless your Exchange server is authenticating
to your fax server, which I strongly doubt you have set up).

If fax.example.com is not IIS SMTP's Default (Local) Domain, then it
could be added as a Remote (Relay) Domain. Or the Exchange server's IP
could be allowed to send to unknown remote domains. All three of these
scenarios would allow Exchange to send mail to your fax server, but
they are quite different. Are you saying that your fax server vendor,
who apparently plugs into IIS SMTP, has not given you any guidance in
this regard? That sounds very untrustworthy.

And do I also need an A record for fax.domainname.com pointing to
FAXSERVER?

Of course. MX records are useless without A records.

--Sandy


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Sanford Whiteman, Chief Technologist
Broadleaf Systems, a division of
Cypress Integrated Systems, Inc.
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