#3 Allow subject keywords by subscription

[Dan A.]

It would be great to define a keyword PER SUBSCRIPTION
line that will be put in the subject of the email
instead of [P4]

Example:
say I have subscriptions:
//depot/ProjA/... -> mailing1@company.com
//depot/ProjB/... -> mailing2@company.com

Then emails triggerd by the first subscription would
have [Project A] instead of [P4] and emails triggered
by the second subscription would have [Project B] (in
the subject line).