[johnkarahalis]

A friend of mine was considering building an anonymous forwarding service and ran into this same question. He also considered allowing custom domains, but if a custom domain is used, is it really anonymous? Couldn't services coordinate to realize that all email addresses under whatever.com are owned by the same person?

[willbrowning]

Yes that's true you could be linked if using a custom domain and someone can determine that nobody else is sharing that domain with you.

That's why I added the additional username feature to compartmentalise aliases and also the UUID aliases.

The UUID aliases all share the same domain e.g anonaddy.me so it is not possible to link ownership of these to any particular user.