I have a mail enabled public folder on an Exchange 2013. I would like to forward all received emails to a Group. The Group is global security-group. I can only choose a user when I use "forward to" under Deliverysettings.

Is it possible what I am trying to do?

Yes, it is possible but only in Exchange Management Shell (EMS)

Example:

Set-MailPublicFolder <Public Folder> -ForwardingAddress "Group Name"

Does that command leave a copy in the publicfolder?

If I run the command, how do I remove the forwarding address?

If you want to leave a copy in the public folder, you need to add a the parameter -DeliverToMailboxAndForward

Example:

Set-MailPublicFolder <Public Folder> -ForwardingAddress "Group Name" -DeliverToMailboxAndForward $True

...and to revert the changes made:

Set-MailPublicFolder <Public Folder> -ForwardingAddress $null -DeliverToMailboxAndForward $False

Super, but Set-MailPublicFolder <Public Folder> -ForwardingAddress "Group Name"-DeliverToMailboxAndForward $True is not working as I hoped. When I test it from a outside mail address the mail goes into the public folder but is NOT forwarded and the sender is notified that the mail is not delivered. Then I test it with an inside mail address the mail goes into the public folder and is forwarded. But I would very much like if it could Work with external mail addresses aswell as internal addresses.

Then you need to change the delivery management settings on the Distribution Group to allow "Senders inside and outside of my organization". The default setting is "Only senders inside my organization" and that will not work for in your scenario.

Super, problem solved.

A small supplementary questions. Is there a way to add text to the forwarded mail, for example. This mail was forwarded from publicfolder

Hi there,

just some additions - with Outlook you can use the folder assistant for configuring rules. I.E. you can create a rule which Forwards mails to users, Groups, etc., send an auto-reply to the sender, delete unwanted mails, a.s.o.

Just right-click on the public Folder in Outlook, choose "Properties" and then "Folder Assistant...".

Best regards

Ben

Can I use more then one groupname in this command?

Set-MailPublicFolder <Public Folder> -ForwardingAddress "Group Name" -DeliverToMailboxAndForward $True