Users cannot send external mail through Outlook Web Access, and if they try
to route (when working in the office) Outlook mail through the Exchange
Server. In their office they can send just fine through their POP mail
accounts, but if they try to send through the Exchange Server, or if they're
on the road and use Outlook Web Access, they get a message of:
Your message did not reach some or all of the intended recipients.
Subject: [Subject Title]
Sent: [Date] [Time]
The following recipient(s) could not be reached:
[Recipient] on [Date] [Time]
There was a SMTP communication problem with the recipient's email server.
Please contact your system administrator.
<[domainname] #5.5.0 smtp;550 not local host [recipient's domain], not a
Any simple solutions?