Forwarding to Gmail - Transient Error (421)

On a couple of my accounts, I’m getting:

"
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 [domain hidden] with ip: [ip hidden] = did not pass4.7.27 4.7.27 — for instructions setting up spf authentication …
"

I haven’t had issues with my other accounts and the setup is pretty much the same…

2 Likes

I have the same problems here

1 Like

Without your domain name I can’t say for certain but that error sounds like you don’t have an SPF record configured.

This was a recent change by Google that they required it.

We do provide assistance in creating your email security records in our DMARC Management

CJ313

@ncormier This error occurs even with the following SPF record defined:

ip4:104.30.0.0/19 include:_spf.mx.cloudflare.net
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 [domain-redacted] with ip: [104.30.8.58] = did not pass4.7.27 4.7.27 For instructions on setting up SPF authentication, go to4.7.27 https://support.google.com/a/answer/10685031 4.7.27 To learn more about Gmail's sender policy, go to4.7.27 https://support.google.com/mail/answer/81126.