qshape -s hold | head postqueue -p | tail -n 1

Some useful postfix commands

//postqueue -p is the same as mailq

List mail queue and MAIL_ID's, list mail queue

postqueue -pmailq

Reload config

service postfix reload

Restart postfix server

service postfix restart

View the postfix version

postconf mail_version

Show default postfix values

postconf -d

Show non default postfix values

postconf -n

Flush mail queue

postfix flush

Process the queue now