It's the first problem I got with BitDefender but it's very big !
Everywhere there is blocks with this message "BitDefender Analyse du courrier sortant"
= analysing mails that are send by me
But I don't send any message !!!!!
Most likely the system is infected.
Run a deep scan and post here the log.
You have posted the same question on the french topic also so I need to know which one you need to keep.