Automatically adding attachments to all outgoing mail messages

A two-part newbie question, guys... I've only just discovered AppleScript and I'm hoping to automagically attach a 'pdf' file to every out开发者_JAVA技巧going (sent) "Mail.app" message.

(Q1) I've got it working successfully in tests running direct from Script Editor - with the file located in the Documents folder - and I'm using:

set pdfFile_Path to ((path to documents folder as text) & "paginatedPDF.pdf")

but the filepath bit confuses me... How would I change this line if I wanted to store my file inside a folder called "PDF's to send" on my desktop?

(Q2) How can I attach the script as a Mail.app rule (the rule options only seem to offer incoming mail message conditions, not outgoing ones)?

Any help/advice much appreciated. Thanks :-)

Have you tried dragging and dropping the PDF straight into your Signature?