Hello, I need to restrict the number of recipients per massage in an Exchange 2010 environment. basiclly i know how to define it in EMC or in Shell, but the problem is that Exchange is considering a Group as one Object! meaning that if for example i restrict a user to send to up to 2 recipients and the group has 1000 recipients he will still be able to send the mail. From tests i made only if the sender expends the group in the "TO" field to show all recipients only then Outlook/Exchange will block the mail. How can i configure Exchange to treat the group by the number of recipients it includes? Thanks in advance!

If you send email to a distribution list you are sending to one recipient that later on forks out to all individual members of that one list after sending the email. If you click on the distribution list name in the To field Outlook resolves the members to individual recipients before sending. As you proberbly realize all is well. Exchange behaves as it it supposed to.Jesper Bernle | Blog: http://xchangeserver.wordpress.com

Is there away around it? or how can i make sure that a user wont be able to send to more then X recipients? The way its defined now, a user can still send to 100 recipients (inside a group) even if he is restricted to 2 recipients.

Well, I don't think so. You could deny him the right to send to the distribution group by adding his account to the list of rejected senders on the distribution group.Jesper Bernle | Blog: http://xchangeserver.wordpress.com

The primary difference in message size limits between Microsoft Exchange Server 2003 and Exchange Server 2010 is in the handling of recipient limits. Exchange 2010 treats a distribution group as one recipient. Exchange 2003 treats each member of the expanded distribution list as one recipient. This change was implemented to avoid the partial message delivery scenarios that may occur in Exchange 2003. Partial message delivery occurs in Exchange 2003 if the number of individual recipients and the recipients that are contained within the distribution list exceeds the specified recipient limit. The total number of message recipients isn't known until after distribution list expansion. Message delivery occurs as the distribution list is expanded until the number of recipients reaches the specified limit. The remaining recipients don't receive the message, but at least the sender receives a non-delivery report (NDR) for each unsuccessful delivery. However, if delivery failure reporting is disabled for the distribution list, the remaining recipients wouldn't receive the message, and the sender would not know who didn't receive the message.MCP, MCSE 2000 , MCSA 2000 ,MCSA 2003 , MCITP , MCTS , MCT

Yep, as stated at the bottom here: Understanding Message Size LimitsJesper Bernle | Blog: http://xchangeserver.wordpress.com

Thank you all!