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This failed on the first disposable email address I tried. A Fastmail masked email address.

> I wanted something simple, fast, and free

You got that. Just not accurate.

> I built this because I kept seeing disposable emails quietly ruin signups, waitlists, and metrics

I do wonder why you think disposable email addresses ruin signups. Esp. given they are often used to avoid signups ruining inboxes with spam.

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> I'll add more resources to find disposable domains and validation points. You can report the domain here so I can add it to the list: https://disposablecheck.irensaltali.com/report.

> As the product owner, if I didn't need real email addresses, I would just use usernames. If there is an email, then a legitimate email address is required. Spam is a different problem.

> You can report the domain here so I can add it to the list

List? You cannot determine whether an address is temporary from a domain list.

> a legitimate email address is required.

i think you need to consider by what measure disposable email addresses are not legitimate.

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