I am getting a 404 error when trying to get certificates for my email

Let's Encrypt nor Certbot support S/MIME certificates.

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Why did it tell me to look for a solution here though?

Because the people who've modified/use Certbot didn't bother to remove/suppress that part..

Looks like their used client just re-uses parts of Certbot.

So effectively they're using parts of an ACME client which never was intended to do S/MIME. And suggesting this Community is also probably an incorrect one. Probably better to request support on some kind of Castle support channel.

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Aha got it thanks!

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