This site did not show evidence of storing passwords in plaintext.
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This site does verify your email address.
Membership Emails
Below is a sample of the emails you can expect to receive when signed up to HAE I.
Thank you for staying tuned with HAEi. The HAEi Family will allow you to also stay updated on hereditary angioedema (HAE).
By confirming your email address you will automatically receive news and updates from HAEi. There is no risk in confirming your email address as you can always opt out of our services.