OS: Windows 2003 SBS
Mail Server: Exchange 2003 SBS
Mail Client: Outlook 2003
Mail Server has been set up to receive mail for two domain names. Mail is received just fine from internet for both domains, and makes it into the mailboxes of the respective users.
User accounts have a mailbox with a primary address for the primary recipient domain, and an alias address for the secondary recipient domain. Email sent to these addresses from the internet make it into the clients' mailboxes without problem.
When the users try to send mail, using the From field, and select either their primary domain address or the alias address for the secondary domain, they get an error message like the following:
Your message did not reach some or all of the intended recipients.
Sent: 10/17/2007 9:51 AM
The following recipient(s) could not be reached:
Someone at another company on 10/17/2007 9:51 AM
You do not have permission to send to this recipient. For assistance, contact your system administrator.
However, if they do not choose a From address, thereby simply using the mailbox default address, the message is accepted by the server, and is delivered just fine.
We have installed Exchange 2003 SP2 on the Exchange 2003 server, and have peformed an Office Update on the clients. What could be the cause of this problem? It seems like an Outlook Client problem, but I can't be sure.