[fetchmail] configure offline mail server

Hi all,

I am trying to use fetchmail with sendmail as an offline dialup mail server. 
From crontab, I 
regularly dial via wvdial to connect with mailserver of my ISP. Through 
/etc/ppp/ip-up.local, I 
start fetchmail and sendmail to flush its queued mail with "sendmail -q" 
command. After that 
dialup gets disconnected. My problem is how can I know or detect that sendmail 
has 
completed sending its queued mail to my mailserver of ISP.

Hoping for your help.

Nabin Limbu
HealthNet Nepal