There’s a doubt of having the Share Preset email mechanism work correctly. In some cases emails were not received or were assigned to spam boxes if you use the same destination email address repeatedly.
If possible, please send yourself a few emails with SHARED presets (Librarian section) and let us know if they are all received ?
Only when I sent a preset from aaa@gmail.com to bbb@gmail.com Get a report like WXLF wrote.
From all other mail providers what I tested (yahoo, GMX) is working great.