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Blocking outbound email to particular email addresses.

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Blocking outbound email to particular email addresses. - 3.Jul.2008 7:14:29 PM   
jzukow

 

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Hi, what we're trying to do is block outbound emails for particular users to particular outside email addresses.  Is this sort of thing possible ? Something like an outbound block list.  Basically we have a few users in our Exchange domain, that send out some derogatory emails to particular email accounts, and what we need to do is block/re-route those emails from going out.  And also prefer that  there aren't any NDR's in the process.  I've tried Recipient/Sending filters, but they don't seem to work.  We're also running GFI me, and I added email addresses on the Custom Blacklist, but they still seem to be getting through.  Any advice would be greatly appreciated.
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RE: Blocking outbound email to particular email addresses. - 4.Jul.2008 2:20:15 PM   
uemurad

 

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You can block a group of your users from sending anything out to the Internet, you can block all of your users from sending to particular addresses, but I'm at a loss to help you configure what you've asked for.

If your corporate management is behind the request, I'd respectfully suggest that they look to resolve this issue by non-technological means (face-to-face or corporate policy) or ignore the ramifications of the Emails.

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Dean T. Uemura
Microsoft MVP - Exchange (2007-2011)
exchangeguy.blogspot.com
uemurad@yahoo.com

(in reply to jzukow)
Post #: 2
RE: Blocking outbound email to particular email addresses. - 4.Jul.2008 7:03:48 PM   
Sembee

 

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I haven't tested this, but putting the external address on a distribution list and then pointing the distribution list recipients at another mailbox. That shouldn't generate an NDR. Like I said, I haven't tested that.

Otherwise blocking the message is easily done, but it will generate an NDR.
http://www.amset.info/exchange/restrict-internetmail.asp

Simon.

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Simon Butler,
Exchange MVP
Blog: http://blog.sembee.co.uk/
Web: http://www.amset.info/
In the UK? Hire me: http://www.sembee.co.uk/
Exchange Resources: http://exbpa.com/

(in reply to uemurad)
Post #: 3
RE: Blocking outbound email to particular email addresses. - 10.Jul.2008 4:06:27 PM   
jzukow

 

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Ok.  Well it can't be solved by dealing with the person directly (upper management).  The user occasionally sends out emails that ruin business for our company.  This person needs to be able to send out with no restrictions that they would know about, and believe that their messages got delivered.   Basically want to create an "outbound" block list or redirect, that we can add to from time to time.  But other users shouldn't have these restrictions.
I will check on the amset.info site and try those steps.
Thanks.

(in reply to Sembee)
Post #: 4
RE: Blocking outbound email to particular email addresses. - 10.Jul.2008 4:14:36 PM   
jzukow

 

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Ok, the option:
Restricting users from sending to a specific email address
You can also stop users from sending to a specific email address.
  1. Create an email enabled contact for the email address that you want to block, using Active Directory Users and Computers on the Exchange server.
  2. After creating the contact, click on the tab "Exchange Advanced" and enable the option to hide the user from the Address Lists.
  3. Click on the tab "Exchange General" and adjust the Message Restrictions. Change to "From Everyone Except" and set to your equivalent of your "All Staff" list.
Would I just add all the external email addresses I'd like to block from sending to, to the "Email Addresses" tab in the user properties ?

Is there a way to do this with an SMTP Connector ?  We have one currently that we use to send to a smarthost, but they're only domain wide, not individual email addresses.  Can I add in a 2nd SMTP Connector ?

(in reply to jzukow)
Post #: 5
RE: Blocking outbound email to particular email addresses. - 10.Jul.2008 5:10:23 PM   
jzukow

 

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Thanks guys.  I think creating a distribution list with all the blocked email addy's worked.  So far so good.  I didn't realize it could be so simple.

(in reply to jzukow)
Post #: 6
RE: Blocking outbound email to particular email addresses. - 10.Jul.2008 5:35:40 PM   
Sembee

 

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An SMTP Connector wouldn't work as that only restricts to a domain level, not to an email address level.

Good to hear the distribution list method worked.

Simon.

_____________________________

Simon Butler,
Exchange MVP
Blog: http://blog.sembee.co.uk/
Web: http://www.amset.info/
In the UK? Hire me: http://www.sembee.co.uk/
Exchange Resources: http://exbpa.com/

(in reply to jzukow)
Post #: 7
RE: Blocking outbound email to particular email addresses. - 10.Jul.2008 5:41:57 PM   
Sembee

 

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I have spotted a potential flaw.
Outlook may resolve the email address to the user group. The only way that you can hide it is by ensuring the group is hidden and is named the same as the recipient.

Simon.

_____________________________

Simon Butler,
Exchange MVP
Blog: http://blog.sembee.co.uk/
Web: http://www.amset.info/
In the UK? Hire me: http://www.sembee.co.uk/
Exchange Resources: http://exbpa.com/

(in reply to Sembee)
Post #: 8
RE: Blocking outbound email to particular email addresses. - 20.Jul.2008 1:50:32 PM   
jzukow

 

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From: CA
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Simon,
You're right.  The addresses in that group resolves as the group name.  In this case I named it "The Block List" which is not good.  So there's no way to turn off Auto-resolve ?

(in reply to Sembee)
Post #: 9
RE: Blocking outbound email to particular email addresses. - 20.Jul.2008 5:07:15 PM   
Sembee

 

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No - because it is an Outlook feature, not an Exchange feature.
If you were able to disable it then it would be an org wide setting, which may not go down well.

Simon.

_____________________________

Simon Butler,
Exchange MVP
Blog: http://blog.sembee.co.uk/
Web: http://www.amset.info/
In the UK? Hire me: http://www.sembee.co.uk/
Exchange Resources: http://exbpa.com/

(in reply to jzukow)
Post #: 10
RE: Blocking outbound email to particular email addresses. - 16.Jan.2009 2:10:28 PM   
jzukow

 

Posts: 17
Joined: 28.Jul.2004
From: CA
Status: offline
We're still having problems with this. I was wondering if we can somehow filter all outbound mail from a particular user, so that other management can pick and choose what gets sent out. The emails have been very derogatory. I have a block distribution list, however if they are new addresses, I can't add them until it's too late. The block list also affects other users from sending to those email addresses. What are any options here ? Could we set up a 2nd exchange server, and only have the problem accounts on there ? Is there any third party software that can do the filtering/redirecting ?

(in reply to Sembee)
Post #: 11
RE: Blocking outbound email to particular email addresses. - 16.Jan.2009 6:51:31 PM   
Sembee

 

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There is no filtering of that type in Exchange 2003. It was one of the major changes to Exchange 2007. I am not even aware of any third party tools that replicate the functionality for Exchange 2003.

Simon.

_____________________________

Simon Butler,
Exchange MVP
Blog: http://blog.sembee.co.uk/
Web: http://www.amset.info/
In the UK? Hire me: http://www.sembee.co.uk/
Exchange Resources: http://exbpa.com/

(in reply to jzukow)
Post #: 12

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