I use my K9 all the time on android. No problems until trying recently to add two accounts.
Today I tried to add two accounts, Yahoo and another on my own mail server and both fail to connect. Errors different but both seem related to authentication.
My account is on Apache typical IMAP mail server. I have three other accounts set up already and all work fine. Adding new one keeps saying cannot connect to server, host not found. I have quadruple checked settings and they are all correct. Exact same settings as in my Thunderbird on desktop work fine there.
Likewise my yahoo login is correct. Have tried that multiple times. email and passwords are correct.
Any ideas why KNOWN CORRECT settings will now refuse to connect to servers that I know are available for connection?
Any ideas most welcome.