Free API to check if email is temp or disposable (disposablecheck.irensaltali.com)

I built this because I kept seeing disposable emails quietly ruin signups, waitlists, and metrics — especially on small projects where every user matters. Most solutions felt heavy, paid, or overkill, so I wanted something simple, fast, and free that developers could drop in instantly.

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.