I have a new Mailcow server up and running self hosted. Email sending and receiving is working great. I have started trying to migrate my current email from Office365 for business, but it is not working. No matter what I try, I keep getting errors saying the password is wrong. But, what the log shows is that office365 doesn’t seem to like SSL or TLS versions that the sync task is trying to use:
Here is an example from the log file if I try to use TLS:
Err 1/1: Host1 failure: can not open imap connection on host1 [outlook.office365.com] with user [firstname.lastname@example.org]: socket closed while reading data from server
The most frequent error is ERR_CONNECTION_FAILURE_HOST1. Check that host1 outlook.office365.com on port 993 is the right IMAP server to be contacted for your mailbox.