Hi, I have a similar problem, I’m trying to set up IMAP accounts and they don’t work. Using the same settings in Thunderbird I can send and receive emails.
When I try to send an email I get this error message:
"Sorry, Mailspring was unable to deliver this message: Connection error: unable to connect to the server/port you provided.
Receiving emails I do receive them.
For months before it was working I have uninstalled and reinstalled all the accounts trying different configurations and they don’t work.
How can I fix this?