Version:           4.7 (using KDE 4.7.1) 
OS:                Linux

Using extra/kdepim-kmail 4.7.1-2
When sending an email, email remains in outbox. on the console, I get following message :
kmail2(6930) MessageList::Core::ModelInvariantRowMapperPrivate::modelIndexRowToModelInvariantIndexInternal: Requested invariant for storage row index  3  not found in history 

last mail that was sent was on september 14th, 4 days ago. Have only sent new mails today, so I can't tell when exactly in the last 4 days the update came, which now causes the issue.



Reproducible: Always

Steps to Reproduce:
send email, or even resend a mail that's already waiting in the outbox

Actual Results:  
mail not sent, error message output on terminal. nothing shown in syslog

Expected Results:  
mail should be sent