This sounds like an issue with your e-mail provider. Or are you talking about Thunderbird?

https://support.mozilla.org/en-US/kb/problems-with-email-how-to-find-help

Thanks Fred,

I changed browsers and it continued. So you may be right. I am on the trail of Yahoo now, and in case it is a hack job, I am changing my password. I'm old and I don't do that often enough. I know they have probably evolved to do the hacks without us knowing .... and I have been expecting it.

When creating a password, make sure it does not have something to do with you. birthdays, anniversaries, special events . . . .

What I do is place my fingers on the keyboard, then randomly press a bunch of keys. Then I go back and change it so it is excepted by the website. Capital/small letter, number, symbol . . .

After, I create a text file with all of my passwords just in case.