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Forums > General Discussion Forums > ArGoSoft Mail Server .NET Edition

SMTP Not bothering to authenticate

Last Post 27 Oct 2009 05:30 PM by Steve Topilnycky. 3 Replies.

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charlesdfw User is Offline

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Posts:4

22 Oct 2009 03:34 PM
Happy 7-year Argosoft user, though only a few months with the dot net version. Our current system is behind a Barracuda router. I have not used SMTP authentication in the past, with only one instance in 7 years of someone sneaking in to do mischief. Pro version was always set to relay for existing accounts only. Seemed to be fine. Set the dot net version to do the same. Again, it's worked fine for months. Now, we've been blacklisted by NJABL.com. These folks test for open relays by trying out several combinations of user names and passwords so they can identify servers using the above scheme and tag them as "open relays." (So now I've experienced 2 times in 7 years where someone snuck in to do mischief, one being supposed good guys). Since, apparently, Barracuda uses NJABL, Barracuda servers are now blocking us. So I gritted my teeth and set Argosoft to require SMTP authentication. It will be a nuisance to go around and change everyone's client, but there you are. Except SMTP authentication being set makes no difference. Even with it set, folks can get in and relay without having their clients set to provide authentication. Similarly, setting POP3/IMAP before SMTP allows an outsider with an existing account to relay without logging in for POP3 first. Anybody have any idea what's going on here? I don't see much point in getting off the NJABL list until I can get it set to block the snoops. Any suggestions of something to try would be welcomed. Thanks. Charles

Ruggiero AV Services User is Offline

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Posts:11

26 Oct 2009 09:21 AM
Have you completely stopped and restarted the ArgoSoft mail service when you made the SMTP authentication change? If you had previously NOT set SMTP authentication, the mail server may have been caching old hosts and allowing them through. A good service I use to double-check my relay settings from time to time is http://www.abuse.net/relay.html. At least then you can see the "interaction" between your mail server and others. - Joe

charlesdfw User is Offline

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Posts:4

27 Oct 2009 03:51 PM
thanks, Joe, yes, I did. Turns out there's a setting in the Barracuda that determines whether SMTP authentication actually makes it to the mail server. Bloody nuisance. I'd rather delete spam. Charles

Steve Topilnycky User is Offline

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27 Oct 2009 05:30 PM
Thanks for sharing your solution. I will be helpful for others have a similar set up.

- - - - - - - Regards, Steve Topilnycky Top Cat Computing http://www.topcatcomputing.com/

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