Paul, thanks, it's Hotmail. I got this reply: I have reviewed the information you provided and have determined that your issue is related to Windows Live ID. We would like to point you to the right direction since it is our goal to provide technical support quickly and accurately to our members. The best department to assist you with your concern would be the Windows Live Technical Support Team. For your convenience, I have transferred your e-mail to the correct department and they should contact you within 24 hours.
Scanning has revealed it was high time I scanned. Have cleaned up but it's still happening, now every time. Either I get nothing in the address field, or something exotic.
Becky I'm really sorry but I was cross-eyed by the time I succeeded in messaging Hotmail Customer Support and I can't for the life of me remember how I did it.
Assimilate yes I guess I'll have to consider changing password, and will certainly do so if that's what Hotmail advise.