[SOLVED] Need a Thunderbird/Evolution alternative which can send me notifs in the background [xfce MX Linux]

[Gnome Calendar Flatpak + Evolution seems to do this fine] /usr/libexec/evolution-data-server/evolution-alarm-notify seemed to be notifying me of tasks. Thank you for all the help.

Some relevant command which might have helped me get the alarm notification thing working

https://paste.debian.net/plain/1293331 backup: https://pastebin.com/pu53kp1d

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I need Calendar but EVERY app I have tried so far doesn't support background notifications or don't run on my system. I want one good app, flatpak or not which can

1. Notify me of tasks, to do lists etc
2. Give me notifications for the mails I receive.

I don't know why, even evolution won't do this for me.

Thank you for your help! I installed flatpak Gnome Calendar after using 1 GB of internet bandwidth but no luck