Re: How to route messages to a server without MX records or Smarthosts?

RFC 2821 and the "implicit MX" rule: Can you really get mail without an MX
record?
http://exchangepedia.com/blog/2006/11/rfc-2821-and-implicit-mx-rule-can-you.html

If the domain resolves to an A record, it should work by default.
Else, create a SMTP Connector for that domain and insert their mail host as
a smarthost.

--
Bharat Suneja
MVP - Exchange
www.zenprise.com
NEW blog location:
exchangepedia.com/blog
----------------------------------------------


"Alan" <bruguy@xxxxxxxxx> wrote in message
news:1172759600.665786.190380@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Hello,

We've installed the MS POP3 and SMTP services on a server hosting a
PDF conversion application. The idea is that user email files to a
mailbox on the server, the application converts the fiels to PDF and
emails back the result.

Say that the conversion server's FQDN is PDF.COMPANY.COM with IP
address 1.2.3.4 and the mailbox is called CONVERT.

Since it's only for one application, we're trying to make as few
changes as possible. Is it possible to route messages to the PDF
server from our Exchange server by simply using the address format
CONVERT@xxxxxxx ? Right now, that gives us a relaying denied error in
Exchange.

Otherwise our options appear to be:
- add an MX record for PDF.COMPANY.COM to DNS and deliver it like all
other external messages;
- create an SMTP connector for the PDF.COMPANY.COM address space with
[1.2.3.4] as Smarthost.

For security reasons, we don't allow POP access on our Exchange
server; unfortunately, that's all the PDF conversion application
supports.

BTW if we have two separate SMTP connectors, one with address space *
and the other with address space PDF.COMPANY.COM (each with cost of
1), how does Exchange chose the right one to use?

Thanks for any advice,

- Alan.



.

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