Attachment to Notice of Hearing Proof of Service by Mail (GC-020(MA)) Gives you more space to list the name and address of people who were served by mail. This form is an attachment to either form GC-020 or form DE-120. Get form GC-020(MA) Effective: July 1, 2005 View GC-020(MA) Attachment to Notice of Hearing Proof of Service by Mail form Go to How-to instructions for Conservatorship Go to Conservatorship Form Packets Go to How-to instructions for Guardianship Go to Guardianship Form Packets Go to How-to instructions for Proof of Service