Ordered identifier should have type "email"

[augjoh]

When ordering an identifier, type dns is used. An RFC8823 conformant order should have type set to email.

Please see https://datatracker.ietf.org/doc/html/rfc8823#section-3 for more information.

[polhenarejos]

This is correct. However, Certbot overrides any identifier type and always sends dns when making a new order. In particular, it uses IdentifierType.IDENTIFIER_FQDN (see certbot code). Awared of this issue, I had two options:

• Modify Certbot. I am reluctant on forking dependencies to fit the needs. Certbot is actively maintained and having a fork only for a single line is a major effort.
• Obviate this issue and adapt the backend. Since email-reply-00 challenge only specifies one identifier type, I adapted the backend to support dns and email identifier types when email-reply-00 is used. This is not 100% RFC compliant but it achieves the objective.

I do not know the future plans of Certbot or even email-reply-00 challenge will be supported. I hope it will, but in the meantime, I provide this temporary solution.