Will do Joe.
I believe this is now fixed. The problem was that some URLs in the content don't work outside the context of the website because the email program doesn't know what domain the link refers to.
So now all links in email messages that don't have the full domain name on them will be replaced with one that does.
e.g., when sending an email if it spots a URL like /help/forums then it'll replace it with http://e-voice.org.uk/help/forums