Understanding spf=none is neither permitted nor denied by domain

I use G Suite to host my business email and I set SPF and DKIM to ensure that no spoofing or un-authenticated emails get sent from my address.

I sent an email to one of my other addresses to make sure that the setup works, but this is what I got in the email headers:

Authentication-Results: mx.zoho.eu;
  dkim=pass;
  spf=none (zohomail.com: HIDDEN_IP_ON_PURPOSE is neither permitted nor denied by domain of MY_DOMAIN) smtp.mailfrom=MY_EMAIL@MY_DOMAIN

Is this what should happen after properly configuring SPF and DKIM?

Update

15 mins after posting this question and another email attempt, I now get a successful message:

spf=pass (zohomail.com: domain of MY_DOMAIN designates HIDDEN_IP_ON_PURPOSE as permitted sender)

I suppose this was because of a delay with DNS propagation.

But the question still remains. What was the original message about?

Solution

If you don't have an SPF record at all, it acts the same as if you had one that returned a neutral response, that is, that it neither permits (with an SPF pass response, what you're now getting) nor denies (with an SPF fail response) email to be sent from that IP. That's all.