Exchange 2007 -- Accessing e-mail using POP3 and Outlook 2003 client

I have currently just migrated from an exchange 2000 to exchange 2007.  Most of our staff connects using the exchange in their outlook client.  There are about 5 clients that get their e-mail either via POP3 or IMAP.  The IMAP seems to work, it is the POP3 that gives me grief.  

Here are the settings for the Outlook Client
The normal settings have been set.  The user credientials, mail server IP addresses, and Login using Secured Password Authentication is checked. Under the "Outgoing Server" tab nothing is checked.  [If this box is checked then when you click the test settings box the send e-mail fails]

Under the "Advanced Tab" I have the outgoing port reading 995 with SSL checked, the incoming port as 25 [587 will not work when you test the settings] with SSL checked.

For the Exchange Hub Transport Default Exchange Client and the Exchange Client under the Authentication tabs they each have the following checked:
Transport Layer is checked
Basic Authentication is check; Offer basic authentication is checked
Exchange server authentication is checked
Integrated windows authentication is checked

When I send an e-mail outside of the organization I receive the folloiwng error:
 550 5.7.1 Unable to relay
My Outllook 2003 client receives e-mail fine.

Any help will be greatly appreciated.
Debbie Hamatani
DebbieHamataniAsked:
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DebbieHamataniConnect With a Mentor Author Commented:
Hi Stefan --

Here is the how I solved my problem above. I actually did not need to set a receive connector, because I was using my Hub Transport client as SMTP connection. I had to do some digging, but this article is what I used: http://technet.microsoft.com/en-us/library/aa997170.aspx.

The problem was with persmissions to the Authenticated Users class. Once I added this permission -- ms-Exch-SMTP-Accept-Authoritative-Domain-Sender all of my POP3 users were able to send through exchange.

Thanks for your help
Debbie
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StefanKittelCommented:
Hello,

did you enable SMTP Login?

Stefan
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DebbieHamataniAuthor Commented:
Where would I enable?  Exchange 2007 or Outlook 2003?
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StefanKittelCommented:
Hello in the client where you set the account with smtpserver, username and password.

See here: http://www.enlightenhosting.com/Support/Tutorials/Email/2007smtp.aspx

Stefan
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DebbieHamataniAuthor Commented:
Hi Stefan --

Set the client as you described above and still received the same error:
550 5.7.1 Unable to relay

Where else should I look?

Debbie
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StefanKittelCommented:
Have a look at your exchange server (Systemmanager). and there the SMTP Protocol.
In the properties there should be a section named "relaying". Set it to relay only if from internal or if successfully authentificatet.

Stefan
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StefanKittelConnect With a Mentor Commented:
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DebbieHamataniAuthor Commented:
Hi Stefan--

Where in the System Manager is there an SMTP Protocol?  That I cannot seem to find.

I did try adding a "Sending Connector" and check all of the persmissions on the Default Exchange Client.

I am still receiving an undeliverable that it is Unable to relay.  

Is there something else I can try?

Debbie
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StefanKittelCommented:
Hello,

find. please close this case so others can find it as solution.

Stefan
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