[NameNickHN]

Disposable mail account that expires after 60 minutes. Costs $60 to host and generates a monthly revenue of $200. It doesn't require any involvement on my part anymore.

[stealthcat]

If I were to start such service today how should I do it? Is SEO the only way? Now if I google "temporary email", top results rarely changes

[NameNickHN]

I a saturated market, you'll need marketing. SEO should be part of that.