We have a very peculiar problem with receiving external emails into "new" public folders.
In the past we have setup a new public folder (eg: Info/Sales) then created an exchange distibution group with an external email address (eg: email@example.com), we have then added the exchange public folder as the sole member of this group. The end result is that an internal or external email sent to firstname.lastname@example.org is delivered to the public folder called Info/Sales. This setup has been working perfectly for a couple of years and continues to work perfectly on existing public folders.
I recently setup a new public folder and exchange distribution group using the same method and cannot receive any external email to this "New" public folder. If I send an internal email (using a mailbox on the same exchange server) the message is delivered without any problem however if I log into my Gmail account and send a message it bounces back with the following error message.
"The message reached the recipient's e-mail system, but delivery was refused. Attempt to resend the message. If it still fails, contact your system administrator"
If I add myself as a member of the new exchange distribution group I can receive the message without any problems however the message is still not delivered to the public folder which is also a member of the exchange distribution group.
It is almost as if there is a tick box for each public folder that I cannot find that says "accept email from outside the organisation" There is a similar option to this in the exchange distribution group which is turned on and is working fine because when I am also a member of the exchange distribution group I receive the message from an external sender.
Many thanks in advance...