Sendmail troubleshooting

#remove unwanted mail messages in queue
cd /var/spool/mqueue

 rm $(grep -l "Subject: free information" *)

 rm $(grep -l "baddomain" *)

 # doesn't really work
 for i in $(mailq |awk '/baddomain/ {print $1}' )
 do
  echo $i
  rm *${i}*
 done

#remove old mailq files
cd /var/spool/mqueue
for i in $(ls df*)
do
        echo $i
        if [[ -z $(mailq | grep $(echo $i | cut -c3-)) ]]
        then
                echo "...removing $i"
                #rm *${i}
        fi
done

sendmail
        mconnect host
        telnet host 25

setup domainname for mailserver
 use check-hostname script to see resolve method

#show aliases for username
/usr/lib/sendmail -bv -v username

#get version of sendmail and hostname resolution
echo '$=m' | /usr/lib/sendmail -bt -d0.1 

#get version of sendmail and hostname resolution
/usr/lib/sendmail -bt -d0.1 < /dev/null

#watch the rulesets resolve user at node
/usr/lib/sendmail -bt
> 3,0 root@node

/usr/lib/sendmail -bi -d44.4

#watch the rulesets resolve user at node
/usr/lib/sendmail -bt 21.6

or link: http://computeranddata.com/doc/notes/sendmail.faq
> 3,0 root@node

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