I noticed it because i started getting spam on the address again *sight*
Short note to those who were subscribed to mailing lists using kdemail service: Check you are still subscribed, but as administrator of the kde-edu mailing list i remember seeing some messages saying "email@example.com has been automatically unsubscribed due too high number of bounces"
Update: Seems only smtp and mail aliases work for now. As imap and pop3 connections are refused. :-/