4.7.27 This mail has been rate limited because SPF does not pass

Unknown error: transient error (421): 4.7.27 This mail has been rate limited because SPF does not pass. Gmail4.7.27 requires all large senders to authenticate with SPF.4.7.27 4.7.27 Authentication results:4.7.27 SPF [example.org] with ip: [104.30.8.6] = did not pass4.7.27

  1. What domain?

  2. Verify your SPF record, and make sure that the mandatory include:_spf.mx.cloudflare.net is included, as well as that there are no syntax errors, and so forth.

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A post was merged into an existing topic: “transient error (421): 4.7.0” when forwarding emails to Gmail

SInce a couple of days most emails are being blocked by Gmail.
Even from gmail itself!
Anything I can do about this, since I see some really import things being blocked?

Here’s an example

Unknown error: transient error (421): 4.7.28 Gmail has detected an unusual rate of unsolicited mail. To protect4.7.28 our users from spam, mail has been temporarily rate limited. For4.7.28 more information, go to4.7.28 https://support.google.com/mail/?p=UnsolicitedRateLimitError to4.7.28 review our Bulk Email Senders Guidelines. m68-20020a625847000000b006e6ff8ba816si3926pfb.11 - gsmtp
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