[imp] problem in imp sending email.

[pratik]

Hie
I have horde-2.0-1, imp-3.0-1, turba-1.0-1 installed on system.When i 
try compose email from imp server it gives me error "The document 
contains no data" & i m unable to send messages but same time if i check 
any servers connecting through imap it shows me email messages, also 
turba is working fine but m unable to send messages, can any body help 
me what can be the cause of this problem ? I have installed sendmail but 
i want to use smtp of my isp & not my system sendmail server  is that 
possible please give me some solution ?? .
Waiting for help

the sight address on which i have installed is

http://mail.vadodaramail.net/horde/

Pratik