On Thu, 2009-05-14 at 14:03 +0100, Hill Ruyter wrote: > Is there anything I can do to fix this problem?
Firstly you could not mask the domain names in your post, but anyway:
contact Hotmail. It's the only option you have. Their filters are well
known for "blackholing" messages, instead of rejecting them.
There are other things you could do, like:
- make sure you have a valid PTR record in place for the IP addresses
being used
- consider creating an appropriate SPF record for your domains
- reject, rather than bounce, failed messages
- ...lots of other things...
Unfortunately there is no way of knowing whether or not this will
improve your domains deliverability.