After upgrading from 3.2.4 to 3.3.1-r1 I ended up with some of my system services seemingly randomly unable to send mail, even though it worked fine from the command line. Found the following in my postfix log: postfix/postfix-script[2883]: warning: not owned by group postdrop: /usr/sbin/postqueue postfix/postfix-script[2884]: warning: not owned by group postdrop: /usr/sbin/postdrop postfix/postfix-script[2886]: warning: not set-gid or not owner+group+world executable: /usr/sbin/postqueue postfix/postfix-script[2887]: warning: not set-gid or not owner+group+world executable: /usr/sbin/postdrop After doing as told by the warning (chgrp postdrop and chmod g+s), the warnings disappeared and my services can send mail again. Looking at the ebuild, I'd assume that the call to "postfix set-permissions" would be supposed to set those. Doing it manually shows it failing though, because I do not have any .proto or .default config files in my /etc/postfix dir, which probably makes it abort early, never setting those file permissions.
Is this a dupe of bug #665280? ("mail-mta/postfix-3.3.1-r1: Many permissions incorrect after update, postfix functionality impaired")
*** This bug has been marked as a duplicate of bug 665280 ***