Years later, kmail still is not a viable email client?

[Stakanov]

In data martedì 13 ottobre 2020 19:16:02 CEST, Peter Humphrey ha scritto:
> On Monday, 12 October 2020 13:19:17 BST hw wrote:
> > So no, kmail is still not a viable email client.
> 
> I can't let that pass. Perhaps something in the way you use it is causing it
> problems, but although I've said some harsh things about KMail2 in the
> past, it's been exemplary here for a few years.

Really, it depends a lot on you distribution. 
If I take my experience with openSUSE that was in Leap (not TW, i cannot 
tell):
15.0 quite well. I thought: it is nearly done.
15.1 quite well if updated from 15.0 but only acceptable if new install.
15.2 showstopper. There were several bugs that make you system either very 
slow if it is new or invalidating it until emergency shutdown for overheating 
CPUs given the multitude of problems (constant reindexing, etc). 

As I do not see this elsewhere, it appears the problem is not alone Kmail but 
the interplay of the QT version, maybe some individual usage (large volume of 
data), the hardware(?), and the choice of database (mysql, mariadb, postgres 
etc) of the distribution. 
But I can assure you the variability I have seen in the last 2 years is so 
large that the statement "not a viable client" may well be the experience for 
a sustained number of user, as for equally many there may be "little 
problems". But as tendency I see people choosing with their feet. And the 
direction is not KDE PIM for the moment. 
YMMV