I am having difficulty allowing users to SEND AS a Mail Universal Security Group. In Exchange 2007, I do not see the Delivery Options under Mail Flow Settings for the Group as I do for Users. In ADUC I have granted the user account Security to SEND AS for that group. The user can send to the group otherwise with outproblems, but just cant select to send an email with the group in the FROM field with out this error. Delivery has failed to these recipients or distribution lists: XXX XXXX You are not allowed to send this message because you are trying to send on behalf of another sender without permission to do so. Please verify that you are sending on behalf of the correct sender, or ask your system administrator to help you get the required permission.

i think you'll have to use set-mailboxpermission cmdlet

Did you get this resolved as i am having the same problem.

I have the same problem, have a distribution group, set"send as" on the advanced properties of the group for the specific users I want to have send from this group, have also ran this "Add-ADPermission "Mailbox" -User "Domain\User" -Extendedrights "Send As", waited for hours/days/weeks as I have read in some articles, yet I still receive " Delivery has failed to these recipients or distribution lists: You are not allowed to send this message because you are trying to send on behalf of another sender without permission to do so. Please verify that you are sending on behalf of the correct sender, or ask your system administrator to help you get the required permission. Am I missing something? Thanks.

This is kind of a funky workaround, but you could turn the group into a user account, usea HT rule to FW the messages to the user account to the former group memembers and user the command at the user level as such: Add-MailboxPermission "Formergroup" -User "Sendinguser" -AccessRights Sendas

Send As a Mail Enabled Group Solution is : On Exchange 2007 server : 1. Add-ADPermission GroupName -ExtendedRights Send-As -user DomainLogonName 2. Wait for refresh exchange cache - no more that 2 hours On Outlook 2007 : 1. New mail. 2. Option Tab -> Show from. 3. Select From : GroupName mcse :security mcdba

Yeah... that doesn't work. Still get "you are trying to send on behalf of". There are a lot of people on the 'net with this problem. Any other ideas? Send As a Mail Enabled Group Solution is : On Exchange 2007 server : 1. Add-ADPermission GroupName -ExtendedRights Send-As -user DomainLogonName 2. Wait for refresh exchange cache - no more that 2 hours On Outlook 2007 : 1. New mail. 2. Option Tab -> Show from. 3. Select From : GroupName mcse :security mcdba

Same problem here with E2K7 SP1, we could really use some help from Microsoft on this one ...!

Yeah... that doesn't work. Still get "you are trying to send on behalf of". There are a lot of people on the 'net with this problem. Any other ideas? Send As a Mail Enabled Group Solution is : On Exchange 2007 server : 1. Add-ADPermission GroupName -ExtendedRights Send-As -user DomainLogonName 2. Wait for refresh exchange cache - no more that 2 hours On Outlook 2007 : 1. New mail. 2. Option Tab -> Show from. 3. Select From : GroupName mcse :security mcdba This is the solution. apart from you also need to make sure that offline address book is updated with changes. This depends on GAL update which is updates immidiately after the changes then it depends on the Offline Address Book generation according to the schedule set on OAB. Finnaly it depends when the client is scheduled to download the Offline Address Book after it is generated from GAL. Get the schedule of offline address generation. (get-offlineaddressbook).schedule | ft starttime, endtime Update offline address book manually. Update-OfflineAddressBook -id <name or idenetity of OAB> Update clients manually once OAB is generated. Outlook - Tools - Send/Receive - Download address book - Download full details - OK. Thanks. Vishal Ramnani MCITP - Exchange 2007, MCSE Messaging, MCTS - Win 2008 Config

Thanks Vishal.Turned out that the issue was that the Distribution Group was hidden from the Global Address List.After setting it to be published, users were able to send emails from the DG's address.

Your welcome. Glad it worked out. Vishal Ramnani MCITP - Exchange 2007, MCSE Messaging, MCTS - Win 2008 Config

I have the same problem, but I use Exchange Online. Where I put the information thad the user xxxxx can send emails for group yyyyyyy

This is kind of a funky workaround, but you could turn the group into a user account, use a HT rule to FW the messages to the user account to the former group memembers and user the command at the user level as such: Add-MailboxPermission "Formergroup" -User "Sendinguser" -AccessRights Sendas this is kind of crazy but it works though.