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7.4

Virtual SMTP Relay Authentication

Asked by SWS001 in Exchange Email Server, SBS Small Business Server

Tags: Microsoft, Exchange, 2003

Hi,

I am fairly new to Exchange and have been tasked with setting up a new SBS 2003 Server with Exchange for a client and am having some difficulties wth the SMTP Relay Authentication.

Currently the Relay is open with no authentication which is prone to attack from spammers.

If I turn off annoymous access to the relay whenever an email is sent from an external source to a user on the SBS Domain the sender gets the following error message bounced back:

----- The following addresses had permanent fatal errors -----
<firstname.lastname@domain.com>
    (reason: 550 5.7.1 Unable to relay for firstname.lastname@domain.com)

Now I know this is because I have currently set the Relay to "only use the following" and in the list below I have added no entries, in the Exchange System manager.

The problem I am having is I'm not sure which IP Address(es)/Domain(s) to put in the list to except as the problem is the emails coming from the big wide world NOT sending to it.

The only way around this is can see is to allow all connections to the Relay, which I have been told is potentially unsafe, as the IP address of the sender will vary from each person.

Can anyone please help, I have been searching for answers but most people seem to find the problem is outbound and mine is inbound.

Thanks in advance,
Mark
[+][-]04/22/08 09:14 AM, ID: 21412614Accepted Solution

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About this solution

Zones: Exchange Email Server, SBS Small Business Server
Tags: Microsoft, Exchange, 2003
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Solution Provided By: SWS001
Participating Experts: 2
Solution Grade: A
 
[+][-]04/15/08 08:26 AM, ID: 21359541Expert Comment

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