This site did not show evidence of storing passwords in plaintext.
This site does allow secured connections (https)
This site did show a clear way to unsubscribe from their emails
This site does verify your email address.
Below is a sample of the emails you can expect to receive when signed up to modelaircraft.
You're receiving this email because of your affiliation with the Academy of Model Aeronautics.
We noticed that you recently started to sign up for a membership or make a purchase on our website, but didn't complete your checkout.
You can complete your membership enrollment here. When prompted, enter your email address. If you do not remember what password you used, you can request a new password via email using the link at the bottom of that page.
If you have any problems or have a question, please let us know We are here to help! Call (800) 435-9262 and select option 1, or simply reply to this email and we will get back with you quickly.
We hope you'll consider an AMA membership. It will connect you with nearly 200,000 other like-minded hobbyists, provide many benefits, and unlock access to more than 2300 flying clubs across the country.