SBS 2003 Exchange email relay problem over VPN

Posted on 2009-02-18
Last Modified: 2012-05-06
One of my users connects to a SBS 2003 box over VPN (SBS Box runs the VPN server and they obtain local IP on LAN subnet) and uses Exchange through Outlook.

Recently, to some. but not all domains they have been getting error code 5.7.1 (unable to relay). In the relaying restrictions in Exchange i have the whole local LAN subnet as well as our WAN Subnet. I have also checked the DNS servers where we use ours and the ISP's.

The user in question has also been able to regularly email this address in the past with no problems.

Can anyone point me in the right direction on how to resolve this?!

Thank you.
Question by:cam-e
    LVL 6

    Assisted Solution

    do a test with telnet if the users faces the same issue
    Is this issue sphoradic

    Author Comment

    No, same few email address and the user has tried each day for the last few days.

    Yes, can telnet to the mail server from our mail server no problems.

    Accepted Solution

    It ended up been that our servers were listed on black lists and have since been removed. thanks!

    Author Comment

    The ip address of our email server was listed on various spam filters.

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