Kmail using 100% cpu

[Mike Clarke]

Kmail has started to consume 100% cpu. It works OK for the first few
seconds after starting but then goes 100% cpu bound and is totally
unresponsive. I've never seen this problem with kmail in the past.

I've tried clearing the akonadi cache but that made no difference.

FreeBSD 11.2-RELEASE-p7
kmail-18.12.1_1
akonadi-18.12.1_1

Any suggestions how to go about fixing this problem?

-- 
Mike Clarke