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How do I turn off DSN

Posted on 2007-12-04
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Last Modified: 2008-02-01
How do I stop exchange from sending Delivery Status Notifications?
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Question by:rugby148
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LVL 104

Expert Comment

by:Sembee
ID: 20404623
Which kind?
Not sending them can actually get your server blacklisted.

If you want to stop them for non-existent users then you should configure recipient filtering.

Simon.
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Author Comment

by:rugby148
ID: 20404801
Yes, I really just want to stop sending them when the user does not exist.  How would I do that under recipient filtering?
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LVL 104

Expert Comment

by:Sembee
ID: 20404869
Recipient filtering is part of the antispam functionality.
Are you using an Edge?
If not, do you have the antispam agents installed?
Or are you using something else (SMTP gateway) in front of the Exchange server?

Simon.
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Author Comment

by:rugby148
ID: 20404885
SMTP Gateway in front of the Exchange Server.

I do not believe the antispam agents are installed.
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Author Comment

by:rugby148
ID: 20404928
Although, I am having trouble finding where to verify that the antispam agents are not installed.
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LVL 104

Expert Comment

by:Sembee
ID: 20404954
If you are using an SMTP gateway you need to look at that first. That is the best place to block the messages, not at Exchange. Look to see if the software you are using on the SMTP gateway has an LDAP lookup facility.

The idea is to drop the messages for non existent users at the point of delivery - so the SMTP gateway. By the time the messages have got to Exchange it is too late.

if the anti-spam agents are installed then there will be an extra tab under Server Config, Hub Transport in EMC called "Anti+spam" (at least I think that is where it was in RTM - I am on SP1 and it may have moved).

Simon.
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Author Comment

by:rugby148
ID: 20406636
Unfortunately my smtp gateway is a secure computing sidewinder g2 and I am unable to modify the sendmail configuration on that device.
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Accepted Solution

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Sembee earned 1000 total points
ID: 20406780
Have you checked with them to see if it can do LDAP lookups? It is a very common thing to do now. Otherwise check with them how it would handle email that is rejected due to invalid recipient before you enable it. Some devices cannot cope with the message being rejected. What you want to avoid is backscatter, which is where  the messages are sent back to the sender. That is bad internet practise caused by spoofing.

Simon.
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