Question

Exchange & Non-authoritative domains

Asked by: Barthax

We have a customer with a non-authoritative domain requirement.  The domain is hosted externally to the server & necessary accounts are retrieved via POP3 & e-mailed into the server.  The domain was originally added to the Default Recipient Policy originally & everything works apart from being able to send e-mails to the "external" users.

Having followed KB 823158 (the "new" version of KB 315591 it seems), the internal users are now able to send to the external users.  The problem is, the server now refuses all e-mails to the domain!  Using telnet, I can confirm that the RCPT TO is refusing any e-mail for the domain.

How can I set this up so that the server continues to accept e-mails for valid users & permits relaying to the external users?

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Asked On
2009-08-07 at 03:17:59ID24634270
Tags

Microsoft Exchange

,

non-authoratative domain

Topic

Exchange Email Server

Participating Experts
1
Points
500
Comments
15

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Answers

 

by: alanhardistyPosted on 2009-08-07 at 04:05:13ID: 25041489

Are you having emails delivered to your server for the secondary domain or delivered via POP3.

If you are non-authoratitive for the domain, getting them delivered will result in failure.

If you use POP3 to collect them, then you won't get any problems.

You cannot be authoratitive for a domain and also expect the server to send mail for the domain externally.  You need to keep the domain as non-authoratitive and get the mail delivered via POP3 for this to work.

 

by: BarthaxPosted on 2009-08-07 at 07:08:11ID: 25042779

The domain in question is hosted (live) at the ISP and the ISP presents POP3 accounts for retrieving the e-mails.  Exchange has no options to collect POP3 accounts so an external utility is being used to collect from the POP3 e-mails and redirect them into Exchange via SMTP.  Two of the individuals are external to the physical location of the business & therefore collect their e-mails directly from the ISP.

Currently, the internal users are incapable of sending an e-mail to the two external users.  Earlier, I followed the guidance of KB 823158 and set the Exchange Recipient Policy to non-authoritative for the domain.  This allows the internal users to send to the external users, but now the server blocks all messages for the domain *despite the users being configured for the domain*.

 

by: alanhardistyPosted on 2009-08-07 at 07:12:25ID: 25042831

The collection externally and forwarding via SMTP is the problem.

If you use something like POPCon - http://www.christensen-software.com/popcon.htm to collect the POP3 mail and have the POPCon on your server deliver the mail to your Exchange users, then you won't have a problem.

The way you are doing it will never work.

The alternative is to setup the two users internally who need access to the external domain to use HTTP over RPC to the ISP.  If this is not possible, then a local POP3 collection program is the only way forward that I can think of.

 

by: BarthaxPosted on 2009-08-07 at 08:00:56ID: 25043436

? POPCon's own image for demonstrating what it does is precisely what I have already... How is POPCon different?

http://www.christensen-software.com/images/mailflow1.gif

 

by: alanhardistyPosted on 2009-08-07 at 08:09:18ID: 25043544

Are you downloading to your own server via POPcon?

You stated "an external utility is being used to collect from the POP3 e-mails and redirect them into Exchange via SMTP".  POPcon downloads the mail via POP3 and then sends them internally to the exchange server.

Your suggestion says to me that you have a 3rd party server somewhere pulling the mail via POP3 and then sending them to you via SMTP.  Is that not correct?

 

by: BarthaxPosted on 2009-08-07 at 08:11:50ID: 25043580

Ah, I see the confusion: the utility is external to Exchange but resides on the same server & is forwarding into the Exchange via SMTP.  (As it happens, the "external utility" is their old e-mail system: Tobit David!)

 

by: alanhardistyPosted on 2009-08-07 at 08:17:16ID: 25043661

That is probably the problem.  To send them via SMTP - you would have to have the domain as authoratitive to accept them.

If you had POPcon on the Exchange server, then this would not be a problem as the mail would be sent internally and would not reply on SMTP, thus would not be querying the authoratitive domains to see if the domain was internal or external.

 

by: BarthaxPosted on 2009-08-07 at 08:19:49ID: 25043693

"the mail would be sent internally and would not reply on SMTP" - POPCon's own description points out it sends via SMTP, so I'm confused as to why you are saying this is different from what is already in place.

 

by: BarthaxPosted on 2009-08-07 at 08:23:29ID: 25043733

http://www.christensen-software.com/support/config_exchange_2003.htm explains where the difference is... I'm not explicitly allowing relay from the localhost.

 

by: BarthaxPosted on 2009-08-07 at 08:24:27ID: 31612814

The suggestion was actually what I had already (just a different piece of software) but the POPCon site had the missing instruction I needed: allowing relay.

 

by: alanhardistyPosted on 2009-08-07 at 08:29:34ID: 25043816

Okay - I was not aware that POPcon used SMTP to forward - there may be another product that does not use SMTP to forward.  Either that or my other suggestion to use HTTP over RPC for the two users would be easier.

 

by: BarthaxPosted on 2009-08-07 at 08:38:51ID: 25043919

Thanks for the suggestions - they got me there. ;)  One of the external users is in charge of the domain, so getting him to change the manner in which he works is a dead-end suggestion (but I didn't expect you to know that). :(

 

by: alanhardistyPosted on 2009-08-07 at 08:40:59ID: 25043941

Good news - glad I was able to help - even indirectly!

 

by: BarthaxPosted on 2009-08-07 at 08:54:02ID: 25044068

Hehe, in this instance, the best way - if you'd have known that POPCon sent via SMTP you may not have made the suggestion & wouldn't have lead me to the solution. :D

 

by: alanhardistyPosted on 2009-08-07 at 08:55:39ID: 25044091

Yes - true - sometimes ignorance is bliss!

20120131-EE-VQP-002

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