On a stock FreePBX 2.11.0.10 distro recently updated to the latest releases I am seeing this warning in /var/log/maillog:
Sep 12 12:10:03 voinet09 postfix/sendmail[27718]: warning: the Postfix sendmail command has set-uid root file permissions
Sep 12 12:10:03 voinet09 postfix/sendmail[27718]: warning: or the command is run from a set-uid root process
Sep 12 12:10:03 voinet09 postfix/sendmail[27718]: warning: the Postfix sendmail command must be installed without set-uid root file permissions.
Sep 12 12:10:56 voinet09 postfix/pickup[25025]: 141C32009C: uid=499 from=
Since the sendmail binary itself does not have the suid bit set:
# ll /usr/sbin/sendmail.postfix
-rwxr-xr-x. 1 root root 213616 Dec 3 2011 /usr/sbin/sendmail.postfix
I infer that this messages is caused by the spawning process
asterisk:x:499:498:Asterisk - VOIP services :/var/lib/asterisk:/sbin/nologin
Is there any way to turn this off?