won't want to accept mail to non-existent mailboxes on sbs 2011 / exchange 2010

Posted on 2014-03-21
Medium Priority
Last Modified: 2014-03-21
my spam fitering service wants us to not accept / wants us to bounce mail to non-existent mailboxes, which he says is not the default setting.

not sure where / how to change that in sbs 2011 / exchange 2010

any advice?
LVL 22

Accepted Solution

David Atkin earned 1000 total points
ID: 39945750

Exchange by default should send bounce backs when emails are sent to invalid addresses.
LVL 63

Assisted Solution

by:Simon Butler (Sembee)
Simon Butler (Sembee) earned 1000 total points
ID: 39945822
They want you to do it at the point of delivery - that should be set by default on an SBS 2011 system (it is not configured by default) and is part of the antispam agents.

In EMC, look under Org Config, Hub transport. You should see a tab for anti-spam agents.
One of those will be recipient filtering. Ensure that it is enabled. Double click on it to open it up and check that "Block messages sent to recipients that do not exist in the directory" is enabled.

In light of your other question about dropping the POP3 connector - this setting only applies to direct SMTP delivery. It does not apply to a POP3 connector delivery.


Author Comment

ID: 39945938
thanks, yeah, it seems to be sending bounce backs by default.

yes, simon, we're moving from pop3 connector to smtp delivery. yeah, the bounce would only apply to smtp.

Heading to the site now.  They hadn't rebooted the server for 8 months.  trying to turn off pop3 and turn on smtp and things weren't working right... can't get in remotely withRDP and logmein after reboot...

look for more questions within the hour : (

Featured Post

Free tool for managing users' photos in Office 365

Easily upload multiple users’ photos to Office 365. Manage them with an intuitive GUI and use handy built-in cropping and resizing options. Link photos with users based on Azure AD attributes. Free tool!

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

In my humble opinion (IMHO), TouchDown from Symantec is the best in class for this type of application, but Symantec has end-of-lifed it and although one can keep using it, it will no longer be supported or upgraded.  Time to look for alternatives t…
Let us take a look at the scenario, you have a database that is corrupt and you run the ESEUTIL command only to find you are unable to repair it. How do you now get the data back?
This video discusses moving either the default database or any database to a new volume.
Exchange organizations may use the Journaling Agent of the Transport Service to archive messages going through Exchange. However, if the Transport Service is integrated with some email content management application (such as an antispam), the admini…

597 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question