ive no experience with the POP3 support even in kmail5 (I stopped using my last POP account a decade ago at least ;-) but the IMAP support in in kmail5 has been pretty good (it used to be terrible).
That said, I still prefer Thunderbird.
By using Debian stable you choose to use 1 or 2year old technology - so you'll have what I have in 2 years. Courage, that's just 24 month to wait ;-)
That said, I still prefer Thunderbird.
By using Debian stable you choose to use 1 or 2year old technology - so you'll have what I have in 2 years. Courage, that's just 24 month to wait ;-)