Hi David!
The "admin" already has your e-mail address by virtue of you registering to the site??
HOWEVER - Ms. Mary Bowes, who is the PGCA "Ace Up The Sleeve" for Memberships, may not have your preferred e-mail address regarding Membership (renewal notices, etc.)... As you may have surmised, some folks have several e-mail addresses, and the one registered to the Forum may not be your preferred address for Membership contact.
As always - whatever e-mail address you provide - to me as the Admin - or to Mary (PGCA Membership) - we will continue to hold your privacy in the highest regard.
You can contact Mary with your preferred e-mail at: pgcamembership(at)gmail.com
My thanks and best to you!
John D.