I just did this on a website that said my Simplelogin alias isn’t allowed for signup, but changed it successfully after the fact from a disposable email.
I’ve used SpamGourmet for decades… it has the added benefit that you can hook in any domain you want, plus it has a bunch of existing ones. Rarely gets blocked, and usually changing the domain is enough to fix any issues.
Of course, only use it on sites where the content being emailed is low PII.
Even SimpleLogin has multiple domains and a personal one can be used.
Nice trick. Also, thank you for mentioning simplelogin. I didn’t know that. I’ve used plus-addressing to be able to at least know who sold my data, but that also doesn’t work everywhere, until now I thought that this is just due to programmers validating mails with regex failing addresses containing “+”. Maybe this trick can be used for that as well.
I’ve done that and forgotten the plus part, so when trying to log in later I was stumped! Pre password manager, of course.
One yay for good password managers
Sadly that doesn’t always works, for example, VRChat blacklists simplelogin, even contacting support does nothing.
Providers like Proton allow you to have fake emails.
