Since version: 16.5

Parameter			Example
created_at	Date when the event was created	String	22 Mar 2016 13:47 (GMT)
action	Description of the action	String	Proof uploaded
details	Details of the action	String	for User1 (notifications sent) by User
filename	Name of the file	String	proof1.gif
workspace_name	Name of the workspace	String	workspace1
user_email	An email of the user who performed an action	String	support@proofhq.com
sent_at	The date when an email was sent	String	23 Mar 2016 10:08 (GMT)
email_sender	The email of email sender	String	notification@support.proofhq-qa.com
email_reply_to	Email sender who triggered an action	String	user2@gmail.com
email_recipient	Email recipient	String	user1@gmail.com
email_subject	Email subject	String	New proof: proof1.gif
email_body	Email body encoded by base64	String	dGVzdA==