can we enable subject details in the qmail logs ?

[TechsG]

Hi guys,

i need to enable subject to be logged in the logs for plesk servers,

Is this possible ?

http://www.textndata.com/forums/subject-field-into-qmail-log-98049.html

As per the above it seems we can dio this using QUEUE_EXTRA and /var/qmail/alias/.qmail-log , but not seeing any such file

Is this possible ?