Email certificate issues, password
My iphone suddenly says the server "certificate can't be trusted" because it expires 8/5/19 -- which is 3 months in the future. It also says my email server does not accept password authentication, which is not correct.
Here's the problem: The certificate IS valid and the email server REQUIRES password authentication.
And please don't tell me to contact the server "administrator" because that is me (since 1994) and my server tech won't answer iPhone questions. This only started with one of the recent updates. No changes in settings or passwords. I can receive but I can't send, using all the same settings that worked up until recently.
I'm not using SSL so the certificate is irrelevant, but the strangest error message is that the email server "is not responding", after which it downloads several messages from the server it "can't reach".
iPhone 4s, iOS 9