Linux Mint 18.3 (Ubuntu Xenial) and claws-mail I did this procedure to test from xenial-proposed.
NOTE: I am not sure this procedure is correct and invite comments! In: Update Manager | Edit | Software Sources | Additional repositories Add: deb http://archive.ubuntu.com/ubuntu/ xenial-proposed restricted main multiverse universe Refresh the cache -- get several updates, deselect all except gnutls28 Perform the update Deselect the added -proposed repository, refresh the cache: all updates disappear from list. Reboot to check if ok. Test: gnutls-cli imap.mail.yahoo.com:993 seemed to connect ok. Test using claws-mail on yahoo imap account: worked. Thank you all for your efforts in getting this to work! -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to evolution in Ubuntu. https://bugs.launchpad.net/bugs/1876286 Title: Evolution reports "Error performing TLS handshake: Internal error in memory allocation." To manage notifications about this bug go to: https://bugs.launchpad.net/gnutls/+bug/1876286/+subscriptions -- desktop-bugs mailing list email@example.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs