MS Server Rejecting IMAP Credentials

smtp is working when diagnostics is tested. IMAP credentials are being rejected

I’m having the same problem.

You need to check that you have the correct security policy set for your server. To do that go to Menu > Tools > Accounts , then click on the SMTP, IMAP or POP3 tabs.

Port 587 = Force usage of SSL/TLS
Port 25 = Use SSL/TLS if available
Port 465 = Use SSL/TLS on special port (legacy)

Port 993 = Use SSL/TLS on special port (legacy)
Port 143 = Use SSL/TLS if available

Port 995 = Use SSL/TLS on special port (legacy)
Port 110 = Use SSL/TLS if available

These are the correct combinations of port and security policy. The underlined ones are the best option for security if your server supports them. SMTP port 465 was reassigned and should no longer be used for SMTP, though many mail providers still recommend and use it.

Thanks.   With Yahoo it’s hard telling what’s going on.   joe