3 ms·Quite a few registration forms do block webmail addresses for reasons of abuse.by ankhmoop 17y agoQuite a few registration forms do block webmail addresses for reasons of abuse.axod 17y agoRegistration forms that were built in the 90s, agreed.ankhmoop 17y agoNo, I regularly find modern registration forms that won't accept mailinator or even hotmail addresses (and your service is probably more akin to mailinator than hotmail).