If you get hit by a spam attack that floods your server with hundreds/thousands of emails from the same sender email address or to the same recipient email address, you can clean your mail queue from these emails with one single command before the mail flood takes your server to its knees.
You can check your current mail queue like this:
postqueue -p
To delete all mails from the mail queue that come from falko@example.com or are sent to falko@example.com (the command is the same regardless of if it's the sender or recipient address), you can use this command:
mailq | tail +2 | awk 'BEGIN { RS = "" } / falko@example\.com$/ { print $1 }' | tr -d '*!' | postsuper -d -
Afterwards check your mail queue again:
postqueue -p
It should now be much shorter.
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