FixVpopmailPermissions

From Qmail Info Wiki

Use the standard procedure to fix vpopmail's permissions...

# chown -R vpopmail:vchkpw ~vpopmail
# chmod -R go=u-w ~vpopmail
# chmod -R go= ~vpopmail/domains
# chmod 6111 ~vpopmail/bin/vchkpw 

You can also download this script (http://qmail.jms1.net/scripts/vfixpermissions) which does all this for you.