Although web mail works with no problems I prefer to use a mail server so I can see all of my emails in one place.
This has worked fine until recently when a couple of things happened, I use thunderbird and the one built into Windows 10.
First one of my emails looked as though it was working and said no mail (Windows 10) but there were emails which could be seen on thunderbird.
Today it got worse both windows 10 and thunderbird would no connect to my main email address again OK with web mail. This time I got an option to fix on Windows mail by entering my password (it made no difference) with thunderbird I got an error which said "Login to server mail.btinternet.com with username @btinternet.com failed."
I am on bt yahoo as I was never changed to BT mail.
Has anyone any suggestions to get a mail server working?