I have been contacted by Cloudmark following sending a form back to them after advice given from this site over emails getting stuck in WLM. Settings have been changed and emailing working fine again thank you.

I am now totally confused and wonder if anyone knows anything about them and what I should do about the following:-

"Thank you for contacting Cloudmark.

 I have reset the reputation of this IP, so you should see delivery improve
shortly. Please note that updates do not occur instantly but should generally
happen within an hour of receiving this response.

Please also note, however, that this IP has dynamic reverse DNS (rDNS).  Many
ISPs will not accept mail from IPs that are not statically assigned, and
dynamic rDNS will affect your Cloudmark reputation score in the future as well
as your reputation with most ISPs and DNSbls.

If you have a static IP address with generic rDNS, you may wish to talk to
your service provider to see if they will assign you rDNS that more clearly
identifies you as responsible for the IP address. If you're sending mail from
a dynamic IP address (as will usually be the case with consumer-level
broadband and dialup), you may want to investigate 'smart-hosting' or sending
your outbound mail through your ISPs primary outbound mail servers.

 --
Cloudmark CSI Support"