I'm totally confused by all this as a non-IT professional.
According to http://www.mxtoolbox.com/ the domains "@leewxm.co.uk" and "@tiptopproductions.co.uk" are blocked becuase of an IP address registered with SORBS and emails sent from Campaign Monitor are being blocked.
SORBS have said that the IP address relating to Australias number 1 spammer.
I Don't know where the problem is or who to ask really ... I just want to be able to send to those domains, I own them!
Any tips appreciated
The first thing to check is whether any of your email is actually being blocked (are you seeing emails actively stopped at all?)
SORBS does not have a great reputation and is being used less and less, as it is known for listing a lot of legitimate senders.