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NST skipping check when CC addresses are not in license list? [message #1093] Mon, 11 April 2005 20:57
daltonrooney
Messages: 4
Registered: April 2005
Junior Member
I have a question regarding the functionality of the license list and how it works. We are using NST SMTP Proxy version 2 with 100 licenses in front of an Exchange server.

We often get spam emails addressed to multiple people. As an example, lets say a spam message comes in addressed to joe@example.com and mary@example.com. Joe is an employee here, Mary is not (she left a year ago). Obviously we don't want to pay for Mary's license, so we don't add her to the list of addresses to scan.

When the spam email comes in addressed to both of them, it *appears* that it's being delivered to Joe without being scanned at all. The cc to Mary is bounced by our Exchange server. Is NST just skipping the check because Mary doesn't have a license?

Thanks,
Dalton
Re: NST skipping check when CC addresses are not in license list? [message #1094 is a reply to message #1093] Tue, 12 April 2005 12:51 Go to previous message
support
Messages: 919
Registered: April 2004
Senior Member
> We often get spam emails addressed to multiple people. As
> an example, lets say a spam message comes in addressed to
> joe@example.com and mary@example.com. Joe is an employee here,
> Mary is not (she left a year ago). Obviously we don't want to
> pay for Mary's license, so we don't add her to the list of
> addresses to scan.
>
> When the spam email comes in addressed to both of them, it
> *appears* that it's being delivered to Joe without being
> scanned at all. The cc to Mary is bounced by our Exchange
> server. Is NST just skipping the check because Mary doesn't
> have a license?

If you rejected Mary's mail outright, this would not happen.

Exchange by default accepts every mail, and then laboriously creates a non-delivery report. Doing it the SMTP way, a mail server rejects a message directly, leaving it up to the sender to create a non-delivery report.

So configure Exchange not to accept mail , but to reject it. You can do this if you have Exchange 2003 or later. For earlier versions you have to use NoSpamToday!'s open relay protection. For more on this topic look here:

http://www.byteplant.com/support/nospamtoday/howtorejectexchange.html

BTW, with the next version we will change the default behaviour of NoSpamToday! when it comes to conflicts like this. In the future, in the case you described, the mail will be filtered.



Customer Support
Byteplant GmbH
Re: NST skipping check when CC addresses are not in license list? [message #1095 is a reply to message #1093] Wed, 13 April 2005 18:12 Go to previous message
daltonrooney
Messages: 4
Registered: April 2005
Junior Member
Thanks. Any idea of how long it will be before the new version comes out? Maintaining that list isn't something we're excited about, so if the new feature will be available soon, we'll just wait.

Thanks for the info.

Dalton
Re: NST skipping check when CC addresses are not in license list? [message #1096 is a reply to message #1095] Thu, 14 April 2005 13:56 Go to previous message
support
Messages: 919
Registered: April 2004
Senior Member
daltonrooney wrote:

> Thanks. Any idea of how long it will be before the new
> version comes out? Maintaining that list isn't something we're
> excited about, so if the new feature will be available soon,
> we'll just wait.
>
> Thanks for the info.

The next release is scheduled for May, 2005.



Customer Support
Byteplant GmbH
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