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Exchange 2003 Authentication Advice

Posted on 2013-05-15
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Last Modified: 2013-06-30
HI, Looking for advice here as I am in uncharted waters, for me , anyway... Been doing these pci compliance scans and up till recently we have been ok - then they add something new that they say is a problem, we fail the test, we fix the problem and then we pass - -the cycle goes on like this and just this week we got a Clear Text password issue on port 25.... So after trawling I found a sembee response to exactly this question and as advised , turned off all authentication except anonymous - and the scan passed the test.

I am happy that it passed the test but am unsure of exactly what was done - because it was through the night,  -i.e. if this had been done through the day time, would it have disabled email to the users, what would not have worked - we have web shops that use the mail server to relay email receipts to anyone purchasing goods -I am assuming that these would have failed?

While the switching off of authentication passed the test, for which I am grateful - is there a longer term permanent solution to this issue (and no doubt the scanning company will hit me with others in a couple of months)

Also , has anyone managed to get away from these scanning companies - we tried but they told us we were non compliant when we let the contact lapse - and then got charged by the bank.... all advice welcome - thanks
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Question by:pabby0612
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Miguel Angel Perez Muñoz earned 500 total points
ID: 39170695
I will to try tell you how this works, I´m not native english but let´s go:

Exchange uses 25 TCP port (SMTP) by default to get emails from other mail servers. Since you let get mails anonymously, you are letting this remote servers place emails on your servers. Thats is ok, and there is normal Exchange operation.
But maybe you require your remote users send emails to other emails servers, (relay) anonymously you must to block, because your Exchange server not let send mails to other servers without authentication. If you permit your server act as open relay, spammers will use your server and your server will be marked as spam sender, and this is not good deal.
How to prevent this?, let your authenticated users to relay. How? I recommend you create another SMTP server and configure authentication (whatever secured) and uses other port different of 25 (p. ex 2225).
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