Created attachment 67810 [details]
Not accessible messages

Version:           4.8 (using Devel) 
OS:                Linux

I have sent some emails to myself and deleted them from the "sent" folder. They appeared in the "trash" folder so I have deleted them from here too. But they appeared again and now they grayed and I can't select and delete them.

Reproducible: Sometimes

Steps to Reproduce:
I don't actually know an exact way, this is what I did:
Sent few emails from my one email account to other, deleted sent mails from the sent folder and then immediately deleted them from the trash.

Actual Results:  
KMail notifying me that I have one unread email but it actually don't allow me to read or at least delete it. So I logged in to my gmail account through web interface and deleted mentioned emails but they still displayed in kmail and I don't even know what to do.

Expected Results:  
This shouldn't happen at all. Actually, why to display such emails If user is unable to manage them? Moreover, one of these messages is still marked as unread but I read it few times and in kmai settings I have "mark selected mail as read after 0 seconds".

I have already noticed such behavior before. Also KMail doesn't mark messages as read. Actually it mark them as read, but after the next email check messages again appears as unread (but not all, some of them remain read). This happens every time, not every day but exactly every time I receive new mail, so I already used a little to check almost every message twice.