If your application sends email, you should consider how your users can "Opt In" or "Opt Out", and Unsubscribe to email. This is especially important, if you send email to the public.

Email services are very sensitive to complaints about "spam" that does not require "opt in" and that cannot be turned off. 

If you violate these principles, we may be required to block your emails.

"Opt In" or "Opt Out"

You should consider providing a way for your users to "Opt In" to receiving email.

Alternatively, you should consider providing a way for your users to easily "Opt Out" of receiving email.

Your "Opt In" or "Opt Out" options should be displayed clearly.

Unsubcribe

Consider providing a way for your users to "unsubscribe" if they no longer want to receive your email. 

You might do this by including a DeepLink in your email that takes them to an "unsubscribe" view in your app.

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