[Evolution] fetchmail and mbox account

[Ambrogio <fn050202 flashnet it>]

Hi all,

I'm using fetchmail to fetch all pop account and delivery it to some
mbox account.

So I use also evolution to read one of this account and I wold like to
know what appens to mbox when sendmail is writing to it for mail
delivery and evo is reading from it deleting read mail?

Tnx
 Ambrogio