“For this reason we have created Onion Mail, your email encrypted with PGP and your data does not reside on a single server but is distributed over the network. You can use Tor for browse the Hidden website and you can encrypt all your emails with your PGP key.'”

If this type of service appeals to you I recommend you check out https://www.privacyguides.org/en/email/

My concerns with this site are the domain will get flagged as a spam / illegal content / threat domain. Which will impact anyone trying to use it as real email.

With no identity / payment gateway it’s inviting people to abuse it.

Being able to attach files to emails sent anonymously is going to intice bad behavior by bad actors.

I like the idea, free anonymous email, it’s my kind of crazy. But when running such a site we need to protect it from abuse or the site will die.