The UI is pretty nice but needs akonadi etc which make it bulky. Also got very confused when ever I lost internet connection.
works pefrectly but can't use it without akonadi on, so i use Thunderbird
I have tried to use it several times, but give up - it works OK with small amount of mails and no filters only
After trying thunderbird (stuck in the 90's), Evolution (stuck in molasas), Kmail was a pleasant surprise. It is fast and reliable. You have full control over the settings, so any issues are likely your own fault. Great software.
Just love it, syncs with google, calendar and contacts. Now not only on mobile but alos on my LIN machine. Defenite one of the want to have ones.
POP-Download is still not working - see https://bugs.kde.org/show_bug.cgi?id=218590 .