When I was running Inc Mail on my other (old) PC. After I'd transferred it from an even older one. It was making me sign in everytime I used it. So I played around with identities and eventually manged to not have to sign in.
When I got my present PC I transferred IncMail to that. Since I was unable to send emails today, I clicked on one of the old identities and I could then send emails?
I just found the problem, I was doing what you suggested nontek, when I noticed that my 'Outgoing Mail (SMTP)' was a 3 digit number and it's usually 2. It should in fact be '25' but was '587'?
The following could just be a coincidence, but it makes you think. Yesterday I received an odd phone call, the phone rang, I said hello and silence, then there was a quiet 'ting' and a recorded womans voice said 'Goodbye'.
Later when I was on line my PC was megga slow. So I unplugged everything from the Broadband box, including the telephone connection. Waited 30 secs, plugged them back in and the PC was back up to speed.
I phoned BT to tell them, but he already new I'd received that call and that I'd dialled 1471 which just said "caller witheld their number"
He said these 'Silent Calls' come from abroad. I asked if they could gain access to my PC or Broadband connection, he said no.
Today I phoned BT again and blocked all such phone calls.