Disclaimer added to email by PT_WF_NOTIFICATION:Notification

I am using PT_WF_NOTIFICATION:Notification to send emails from an app engine. I use a generic notification template to populate subject and email body. My template doesn't have any disclaimer text. When process sends email, it adds following disclaimer

"This message is confidential and may be legally privileged.  Only the addressee and the addressee's agents may use, copy or disclose the message.  If you have received the message in error, please delete it and notify the sender by reply e-mail.  Thank you very much."

This disclaimer is misleading as email is sent from a generic email address by process scheduler. I want to remove it or update it. First I thought that somehow email server is adding this but other App Engine process that use "SendMail" function don't add this disclaimer so there is something in PT_WF_NOTIFICATION:Notification that is adding the disclaimer.