Re: How to ensure genuine emails despite valid email format?

Part of your problem is that email is a fire-and-forget application.  Once it's sent out, its in the control of the email server for routing.

1. I don't know of a way to handle this without having any access to the account the user uses to send the email
2. Use a whitelist of valid email senders, but this is a neverending task with high probability of false positives.  And disposable email addresses have their valid uses, and I use them frequently to help control spam. So if you block those, you might be angering alot of your valid users
   
3. Same with 2, whitelist
4. Same with 2, whitelist

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