[enhancement]: SSL Certificates

[nomadturk]

Which feature or improvement would you like to request?

I would like to be able to upload, make active SSL certificates, auto-delete old ones.

Currently, the SSL generation only works for the MX domain.
So it is kind of useless. This should be extended to any other domain that's added to the system.
Either via ZeroSSL or Let's Encrypt, we should be able to do this via file verification as ./well-known is open to the world.
Additionally, administrators should have the ability to add their own certificate and select to use it.

This would help fix MTA-STS, AutoConfig and AutoDiscover records as they all fail due to SSL certificate errors.

Is your feature request related to a problem?

I'm having a problem with...

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