????
My New Zealand ISP unfortunately got mixed up with Yahoo! a few years ago, and nothing has been the same since.
I'm currently away from home and using public library computers to read my webmail,but .... a couple of days ago I discovered that I can no longer send a copy to myself, the Yahoo! system just refuses to acknowledge my own address as a To or c.c., so I can't send a copy for my wife to pick up from another public computer, as we occasionally find necessary, I have to send it to Gmail, then open Gmail and forward it back to our regular address !
Until I get home I won't know if this problem now afflicts my own computer, or is some sort of 'filter' in the public library ? and why ??