In one shot:
 postqueue -p | tail -n +2 | awk 'BEGIN { RS = "" } /@domain\.tld/ { print $1 }' | tr -d '*!' | postsuper -d -
In one shot:
 postqueue -p | tail -n +2 | awk 'BEGIN { RS = "" } /@domain\.tld/ { print $1 }' | tr -d '*!' | postsuper -d -