TLSv1.3 is now very important to use so kindly support it.
@ibahnasy how did u come to the conclusion that TLSv1.3 is not supported? as this might be the culprit of the issue I’m seeing [Bug] - Unknown mailsmtp error 27 (SSL Error) when adding IMAP/SMTP account · Issue #2004 · MailCore/mailcore2 · GitHub (btw, yes… it is simply relying on the mailcore2 library capabilities)