a) - you can use a service like http://www.bulkemailchecker.com/ - there
are a number of them that have an api you can verify the email address on
form input.
b - d) you can use https://mxtoolbox.com/ api to find blacklisted IP's and
domains.

Another option is to add a verification step - send the user a verification
email for them to reply to.

David

On Sun, Dec 29, 2019 at 9:16 AM Roshan Shah <[email protected]> wrote:

> There is a problem when a person enters valid email format but it is
> either
>
> a) An invalid email which bounces
> b) A valid email but using one of disposable email which means it is a
> fake profile
> c) Emails from domains that are marked as spam
> d) Emails from IP addresses that are marked as spam
> How do we ensure that before we accept emails, both the above cases are
> put in pending status with appropriate message and reason code to put them
> in pending?
>
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> [email protected] / (519) 496-8860
>
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-- 
David

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