Question : how to create email with vpopmail (vadduser) using php ?

I have some trouble since this morning to get this working:
- i have a webserver with apache, php and vpopmail running

i can run this command from shell :
/home/vpopmail/bin/vuserinfo [email protected]

but this doesn't in php:
exec("/home/vpopmail/bin/vuserinfo [email protected]");

I have already tried to use it with sudo by adding this line with visudo to my sudoer file:
nobody  ALL=(ALL) NOPASSWD: ALL

exec("sudo -u nobody /home/vpopmail/bin/vuserinfo [email protected]");
gives me "Error: unable to setuid"

also tried with root:
root ALL=(ALL) NOPASSWD: ALL

exec("sudo -u root /home/vpopmail/bin/vuserinfo [email protected]");

but no luck !

thank you for help

Answer : how to create email with vpopmail (vadduser) using php ?

Is your web server running as 'nobody'? Nobody probably has no shell set, preventing you running anything.
Have you tried running the vpopmail command as the vpopmail user instead of nobody?