OS is Vista and i use Windows mail ( and mailwasher free) have used all these for several years. Server is btinternet, by the way.
Only recent change of ANY kind was a week ago when I switched from IE to Mozilla Firefox for internet access.
Everything fine yesterday morning ,later in the day suddenly I couldn't send any emails. Incoming mail was, and is, still perfectly OK.
I hadn't changed anything; but when I click Send I see a WINDOWS SECURITY message that directs me to Logon to my usual email account and "verify that both the user name and password are correct for your server."
They are. And when I enter them again in the boxes I get same message.
I can use webmail, but I want to use Windows Mail. I've checked all the settings and they seem to be Ok, unchanged from what they usually are.
Any advice/solutions please?