I have a client who has a SBS2003 server and a handful of Blackberrys. The method of enabling these to receive email has always been to create a contact in Exchange with the email address of the Blackberry. The user's mail is then forwarded to this contact from within Exchange.
This has always worked in teh past but over the past week or so most email has stopped arriving at the Blackberry.
Sending an email directly to the Blackberry works fine.
Sending an email to the user arrives in the users inbox and there is a message in the outbound SMTP queue which is destined for the Blackberry email address.
Once this email disappears from the SMTP queue a message appears in the event log on the server to the effect that the sender's email address will not be relayed by the ISP.
This has worked in the past, so I'm now scratching my head to figure out if it's the ISP that's changed their policy (It's BT by the way!) or whether some authentication setting has changed on the server's outbound smarthost connector. I can't honestly say that I know what the setting *should* be on the server in order to figure out if anything's happened there.