07-27-2012
It's telling you the problem -- /etc/mail/trusted-users or /etc/mail is world-writable. Someone must have used the magic sledgehammer, chmod 777-ing it in the past in a misguided attempt to fix a 'problem'.
When something is running as root, loose permissions are a big deal. Anything could inject malicious contents into there and mislead a root daemon, possibly executing arbitrary commands or escalating permissions. So it does checks on it that it wouldn't when running as a limited user.
Reduce the permissions to what you actually need.
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LEARN ABOUT DEBIAN
sensible-mda
SENSIBLE-MDA(8) System Manager's Manual SENSIBLE-MDA(8)
NAME
sensible-mda - a generic local MDA router for Debian systems
SYNOPSIS
sensible-mda from to detail client-addr
DESCRIPTION
sensible-mda is used to simplify the installation and configuration of sendmail(8) , or other MTAs for use on Debian systems. With sensi-
ble-mda, sendmail can support a plethora of MDAs (procmail, maildrop, deliver, etc.) without having pick any one of them as required.
FUNCTION
sensible-mda is called by sendmail as a local mailer when the following exists in sendmail.mc:
define(`LOCAL_MAILER_ARGS', `sensible-mda $g $u $h ${client_addr}')dnl
sensible-mda will look for the following MDAs (in this order), and pass the mail on to the first SUID MDA found (Or first found MDA, if run
w/euid=root): procmail(1), maildrop(1), deliver(8), mail.local(8)
OPTIONS
Available command line options are the following:
from The sender of this email (sendmail $g variable)
to The recipient of this email (sendmail $u variable)
detail The detail portion of the recipient userid (sendmail $h variable) - ie:
cowboy+sendmail@debian.org
client-addr
TCP/IP address of the sender (sendmail ${client_addr} variable) Not used (for the nonce)
FILES
/etc/mail/sendmail.mc
sendmail m4 input to generate sendmail.cf
/etc/mail/sendmail.cf
actual sendmail configuration file (treated as a binary file)
SEE ALSO
sendmail(8), procmail(1), maildrop(1), deliver(8), mail.local(8)
BUGS
None known so far.
AUTHOR
Richard Nelson <cowboy@debian.org>
HISTORY
4th Berkeley Distribution October 21 1999 SENSIBLE-MDA(8)