[MS Exchange] Send As

Hi,

We're setting up a helpdesk departement at our office and I'm trying to setup an e-mail system for them.

We're using MS Exchange 2003. I've created a distribution group called support@xxx.com with all helpdesk people as members.

Sending mails to this adress works perfect and everyone in the group receives them.

When replying to the e-mail, the mails should be send using the distribution group's e-mail adres (support@xxx.com).

I've done some research and I found out that this is possible by going into the ADUC, group properties, security - advanced, adding the members and giving them Send As rights.

After adding the "FROM:" field in outlook and typing the group's name there (support@xxx.com), the mail's get bounced when I send them with the following message:

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

Maybe it was the slow permission updating of microsft but after 3 hours I still get the same message.

Any ideas?

Thanks in advance!