The ISP is kijoma.net - This supplier serves our local area in West Sussex, UK via radio link. My connection is via an ethernet cable to the roof aerial which points to kijoma's server. Nice fast network.
My emails to colleagues are still silently vanishing into the ether.
My ISP Tech support have replied to me as follows:-
If Apples servers are on the spamhaus database as a spam source then nothing will change when we move host as we use the paid for spamhaus database to block spam on incoming here.
However as the post states, it shouldn't affect outgoing from us to them, unless there is a filter apple side that blocks their own servers.. this could be a big footshoot for them but when we had a spam issue from a virus infected customers PC, our mail server also blocked itself, as spamhaus flagged it.
I suspect they are paying somebody somewhere to run a filter service.
Sounds like they need to get their act together on the email front..