As I still use webmail access for my emails I unfortunately cannot help you with the correct setting for using an IMAP email client program. There's this on this site: https://community.plus.net/t5/Email/Diagnosing-email-server-connectivity-issues-the-guide/td-p/20079...
Email server configurations
An email account connects to two components: inbound (IMAP or POP3) and outbound (SMTP) servers. Those connections can be with and without encryption, which for the inbound servers means different ports.
Each email brand has its own sets of differing server names some supporting encryption and in some cases not. These have been documented in various forum support pages but are not now guaranteed to be correct; those documented here have been tested to affirm their accuracy.
The server names listed below match those in the security certificates; others might work (without encryption) but will encounter 'certificate' issues if encryption is set. Similarly other ports might work, but those documented below are the correct ones. Where encryption is supported it should be TLS/SSL on the inbound server (IMAP / POP3) and STARTTLS for the outbound server (SMTP).
etc.
It's a bit technical and not all of it may apply to your situation. But there are lots of other posts around here about the correct settings for SMTP server and so on.
Good luck!
