I have been using KDE for a while, while I like many features I am looking for suggestions to the default email client:
Kmail - completely unusable for me and the only one which could maybe be integrated with kontacts, it could not receive mails from IMAP or pop or would receive only sometimes
Geary - good but too minimal, I need at least some kind of contact list and mailing lists feature, maybe this integrates with gnome contacts? I couldn’t find anything in settings
I’d be wary of that fork. It’s run by a former Thunderbird dev that got banned for his toxic attitude and hasn’t really improved since. Just take a look at the projects website. Being so unrespectful towards your upstream project should have no place in open-source.