We have a Win2K AD domain running a single Exch Server 2K and have recently experienced a problem that only happens for messages sent to a particular domain. We have several folks who use Blackberrys and we set up a forwarding (contact) so that all emails sent to the persons mailbox are also sent to their Blackberry account. In chis case, it is vzw.blackberry.net.
These have been running fine for the past year - 18 months and recently, within the past 2-3 weeks, we have had this problem.
In my testing, I discovered that messages were getting stuck in the SMTP queue and did not go out promptly but in batches with very odd delays. I've sent emails, from a different domain, directly to the Blackberry email address at the noted domain and they go right through. It is just when the are forwarded via the Exch server... they are delayed. I have no other problems with any other domain in sending emails. all except the ones to the blackberry domain go immediately.
I would appreciate any help on this... the folks at Verizon have indicated it is our problem and with the testing I have done... it appears that way.
Thanks for your assistance!