> My reasoning on including this is that an email with a mozmail domain is never going to be a primary email and is always going to forward to some other address.
This is laughable and sad at the same time. I have a few tens of email addresses that are used for different purposes and with different classes of sites and services. None of them are “primary” and I wouldn’t really give one address used for one purpose to a service that I classify under another. People also use aliases on email services, and those are also “forwarding” emails in a way. This point about forwarding is a poor distinction.
As other comments in the issue have stated, adding Firefox relay domains to this list is a user hostile move with no benefits. I’d love to see them try this with Apple’s email relays (used by Sign In with Apple if a user decides to hide their email address).
[1]: https://github.com/disposable-email-domains/disposable-email...