[Dovecot] inbox file read/write

[Yedidia Klein]

Hi,

If I config my mta to write incoming mail to /var/mail/[username] and 
dovecot (or any other imap/pop server) is serving email from this file, 
can't the fie be corrupted while mta and dovecot read/write at the same 
time ?

is there any mechanism to avoid it ?

thanks

--Y