Postfix Queues Raw
Listing
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postqueue -p
# This will work as well
mailq
Deleting All Messages
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postsuper -d ALL
Deleting all from Specific Address
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mailq | tail +2 | grep -v '^ *(' | awk 'BEGIN { RS = "" } { if ($8 == "email@address.com" && $9 == "") print $1 } ' | tr -d '*!' | postsuper -d -