So this is a similar post to the previous one on deleting messages to a single recipient, except this focuses on deleting messages from a recipient. It works quite well if a spammer blasts you from a single address.

To remove the nuisance mail from the queue, use a similar command as last time, except $7 indicates the senders address:

 

mailq | grep -v '^ *(' | >awk 'BEGIN { RS = "" } { if ($7 == "user@example.com")print $1 }' | tr -d '*!' | sudo postsuper -d -

*Note this command is cut of due to the width of the site. if copying make sure you select all of the text.
 

This will search the mailq for messages with a specific sender “user@example.com” and pass the message(s) to postsuper with the delete option. Please note that you will need to update the email address used in the example with the one for your sender. The command is also meant to be on one line, and has been reformatted to display on the website.

 

You can find more information from the content-source: http://themomorohoax.com/2010/05/10/deleting-messages-to-a-specific-recipient-from-the-postfix-queue