Script check quemail stuck on server and alert mail to mailadmin for resolve
vim checkquemail.sh
---------------------------------Start---------------------------------------------
#!/bin/bash
#Start check quemail on system
PATHCHECK="/home/user/quemail.txt"
/usr/sbin/postqueue -p |tail -n 1 > $PATHCHECK && /usr/sbin/postqueue -p |grep "^[A-F0-9]" |sort -k5rn -k6n >> $PATHCHECK
#If found quemail stuck on systems and then send mail alert to Systemadmin
#Set the variable which equal to zero
prev_count=0
count=$(grep 'MAILER' $PATHCHECK | wc -l)
#check word 'MAILER' on text file on path $PATHCHECK if more than 0 do next step
if [ "$prev_count" -lt "$count" ] ; then
# Send a mail to given email id when errors found in log
#SUBJECT="WARNING: found $count quemail was stuck on mailgw, pls check now "`date --date='yesterday' '+%b %e'`""
SUBJECT="WARNING: found $count quemail was stuck on mailgw, pls check now."
#This is a temp file, which is created to store the email message.
MESSAGE="/tmp/logs.txt"
FROM="noreply@domain.com"
TO="mailadmin@domain.com"
echo "ATTENTION: found that there are $count mail queues in the system left to be sent for urgent inspection." >> $MESSAGE
echo "Server: `hostname`" >> $MESSAGE
echo "\n" >> $MESSAGE
echo "+------------------------------------------------------------------------------------+" >> $MESSAGE
echo "$count mail queues" >> $MESSAGE
echo "+------------------------------------------------------------------------------------+" >> $MESSAGE
grep -i "`date --date='yesterday' '+%b %e'`" $PATHCHECK | grep 'MAILER' $PATHCHECK >> $MESSAGE
#list quemail stuck on system
mutt -s "$SUBJECT" -e "my_hdr From: Server Info <noreply@domain.com>" -- "$TO" < $MESSAGE
rm $MESSAGE
fi
---------------------------End Script----------------------------------
Create crontab for run script
---------crontab -e --------
# m h dom mon dow command
*/30 * * * * /home/user/./checkquemail.sh
#check every 30 minute
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Ref: https://www.2daygeek.com/linux-bash-script-to-monitor-messages-log-warning-error-critical-send-email/
