Permission denied - Ownership qmail-local
Qmail can present some errors in the maillog file. The most common is very likely to be:
qmail-local-handlers[......]: cannot create temporary file - (13) Permission denied
A solution to this problem has been given in the following thread:
http://forum.parallels.com/showthread.php?t=87343
In his post, Johannes Frank simply points out the solution (and indicates a bug in the qmail default installation).
A summary of steps:
1 - go to
/var/qmail/bin
2 - change ownership of qmail-local, with command:
chown mhandlers-user.popuser qmail-local
3 - do the following command:
chmod g+s,g-r,o-r
4 - restart qmail with the command:
service qmail restart
Problem should be resolved now.