He never usually does this it has only been a certain few, rest have came with email addresses attached.
When he was sent an email stating I enjoy recieving them from him but if he has to go to the trouble of deleting who these few have come from then not to bother sharing for it bothers me he feels the need to hide the sender. Hasn't bothered to give explanation as to why he did this??
Had an incident a while back with phone and ex in as special friend so makes me wonder

Well, don't know what to tell you then.

Could be he thinks you'll react badly to whomever's name is attached to the email. Maybe you could assure him that you won't ax him in his sleep (it is Halloween after all) or something.