WRONG
Please find the template agreement enclosed to this email.
RIGHT
Please find the template agreement attached to this email.
Emails have attachments – an attachment is attached to an email.
Letters, or anything else sent by post or courier, have enclosures – an enclosure is enclosed with a letter.
For example:
Please sign the POA enclosed with this letter and return it to us as soon as possible.
Common Mistakes in Business English 
What if we use a fax?
Attached.
Can I therefore write: “Please find enclosed your documentation”?
Yes