I have problem where my email from outlook 2002 is not going into the outgoing queue in exchange 5.5, for some people it does, and for others it just doesnt appear, and therefore does not get sent.
How this works is the mail is sent from outlook to exchange which queues them (keep hitting refresh and you will see every message sent go by). Exchange them tries to send these messages once it has figured out how to get it there.
Sometimes it can't figure out how this happens and it will sit in the queue until either it manages to connect or it times out.
There are many reasons why some messages don't go MX lookups, DNS errors, target server being down etc. So I'd need a few more details about the behaviour before helping.
If you're right about the blocking it won't be done by BT it would be Hotmail which has blocked mail from your domain.
Good luck on getting Hotmail to remove you. We're trying. We've never had an open relay and only show on 3 out of 150 spam databases (no major databases and the ones we're on are as a result of netblocks of our ISP).
The nearest we can figure is that spammers spoof @hotmail.com addresses so then any NDRs from invalid addresses at our domain or any spam rejected by our spam filter gets bounced back to hotmail. Unfortunately we can't turn NDRs off because we need our clients to know when they're mail is bounced either because of an invalid address or because of it being interpreted as spam (it doesn't happen often, but it does happen - usually because the client likes to use decimal points or !!!!).
Some interesting reading here is at the link below, not that it will solve your problem.
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