List of helpfull command that used to help me when maintaining Postfix mailserver. I can put many things to my head so i create this cheatsheet to help me with postfix administration.
Hemat Pangkal Kaya
Insignificant one
List mail queue and MAIL_ID’s, list mail queue
1 | postqueue -p |
1 | mailq |
Check the postfix version
1 | postconf mail_version |
Get default value set on the postfix config
1 | postconf -d |
Get non default value set on the postfix config
1 | postconf -n |
Flush the mail queuw
1 | postfix flush |
Force to send the queue
1 | postqueue -f |
Process all emails stuck in the queue
1 | postsuper -r ALL && postqueue -f |
Read email from mail queue
1 | postcat -q MAIL_ID |
Remove certain mail from mail queue
1 | postsuper -d MAIL_ID |
Remove all mail queue
1 | postsuper -d ALL |
Fast method to remove mail from queue
1 | find /var/spool/postfix/deferred/ -type f | xargs -n1 basename | xargs -n1 postsuper -d |
Remove all the deferred mail in queue
1 | postsuper -d ALL deferred |
Sorting email with “from address” filter
1 | postqueue -p | awk '/^[0-9,A-F]/ {print $7}' | sort | uniq -c | sort -n |
Remove all email that sent to [email protected]
1 | postqueue -p|grep '^[A-Z0-9]'|grep user@dom.ain|cut -f1 -d' '|tr -d \*|postsuper -d - |
Remove all email sent from [email protected]
1 |
Remove all email sent from the dom.ain
1 | postqueue -p | grep '^[A-Z0-9]'|grep @dom.ain|cut -f1 -d' ' |tr -d \*|postsuper -d - |
Mail queue stats short
1 | postqueue -p | tail -n 1 |
Number of emails in Mail queue
1 | postqueue -p | grep -c "^[A-Z0-9]" |
Fast count of emails in mail queue
1 | find /var/spool/postfix/deferred -type f | wc -l |
Watch Log Live
1 | tail -f /var/log/maillog |
Count and sort success pop3/imap logins
1 | grep "\-login" /var/log/dovecot-info.log |grep "Login:"|awk {'print $7'}|sort|uniq -c|sort -n |
Count and sort success SMTP postfix logins. This is usefull when you want to track a compromised account.
1 | grep -i "sasl_username" /var/log/maillog |awk {'print $9'}|sort|uniq -c|sort -n |
Count and sort success SMTP postfix logins on exact date “May 18”
1 | grep -i "sasl_username" /var/log/maillog |grep "May 18"|awk {'print $9'}|sort|uniq -c|sort -n |
Analyze Postfix Logs
1 | pflogsumm /var/log/maillog | less |
You may need to install the pflogsumm package first.