Glo Networks Technical Blog (Glo Blog)

Ever had request to block an e-mail address? We had one from a customer last week so we decided to use Transport rules in exchange 2007.

These work in the same sort of way that Rules do in Outlook but on a global level.

We setup a transport rule to send a rejection back to the sender, you can either leave the standard message (see Below) or you change the rejection message and error code if you wish.

You can setup transport rules through the Exchange Management console, in organization configuration, under Hub Transport go to the Transport Rules Tab and select ‘New Transport Rule’ down the right hand side.

Example of the rejection message -

You do not have permission to send to this recipient. For assistance, contact your system administrator.

<Domain.local #5.7.1 smtp;550 5.7.1 Delivery not authorized, message refused>

Posted by Dave in General | 1 Comment »

By default, in Exchange 2007, distribution groups cannot be mailed without authentication. This means that any distribution group that receives external mail will respond with a rejection, until this default behaviour is altered.

#5.7.1 smtp;550 5.7.1 RESOLVER.RST.AuthRequired; authentication required

A good idea in the face of spam, except that this change in behaviour isn’t really shouted about much in the documentation.

The GUI way to alter this is to head into the Exchange 2007 Console, head into the properities of the distribution group, and then the Mail Flow Settings. Select Message Delivery Restrictions and then click Properties. Untick “Require that all senders are authenticated”.

Posted by Karl in General | No Comments »