[imp] Modify email subject

[John]

Hi there,

I have recently setup hylafax to receive faxes and forward them as pdf 
attachments to my IMP user account.  The subject line automatically contains 
the sender fax number such as " Facsimile received from XXXX-XXXX"  Which is 
great for automatic sorting of messages by procmail based on the sender 
however when there are many messages from the same sender it is very 
difficult to find a specific message at a later date.

I wish to add a "Change Subject" button in the IMP message view so I can 
modify the subject line of the email when I first view the attachment, to 
allow easy recognition of the messages in the mail folder and remove the 
need to open the attachment every time I want to find a specific message 
into the future.

Can I add a few lines to message.php or something similar to achieve this 
functionality?

Any help appreciated, thanks.

OPJR