Mailspring cannot connect to TLS1.3 only IMAP / SMTP servers.

Author: CRCinAUCreated Sep 15, 2025Updated Apr 19, 2026

Objective

Tested on Fedora 42 using the RPM install method.

Reported here, as it seems the discourse servers are currently down - leaving no path to report an issue at all.

Log of error shows:

----------IMAP----------
connect <mailcore::IMAPSession:0x7ffca98ea9d0>
ssl connect <imap_mail_server_name> 993 43
connect error 43

Source: Foundry376/Mailspring