[TemporaryMail]

That's great advice and although there's already an open source solution available, there's some hassle involved in setting it up.

I will definitely look into these solutions and although I've seen some of them around, there could maybe be a way to implement a better alternative that's both easy to use and safe so it doesn't get abused.

[kukkeliskuu]

I don't think I would pay for temp email service, or be bothered to set up open source one by myself. But if I could buy a throwaway domain name from company that specializes in temp emails as a package deal, then I would be tempted.

[TemporaryMail]

Right, that actually sounds like a decent idea and since the users would then have verified themselves with their payment details, it would reduce the risk of abuse.