Gmail rejecting emails sent via SES


I use SES, currently without dedicated IPs. For the last 3 days I've seen the following type of error:

{"emailAddress":"<REDACTED>","action":"failed","status":"4.4.7","diagnosticCode":"smtp; 554 4.4.7 Message expired: unable to deliver in 840 minutes.<421-4.7.28 [ 15] Our system has detected an unusual rate of<CRLF>421-4.7.28 unsolicited mail originating from your IP address. To protect our<CRLF>421-4.7.28 users from spam, mail sent from your IP address has been temporarily<CRLF>421-4.7.28 rate limited. Please visit<CRLF>421-4.7.28 to<CRLF>421 4.7.28 review our Bulk Email Senders Guidelines. d19-20020a0cdb13000000b006418e876d0bsi8784215qvk.10 - gsmtp>"}

This is only affecting Gmail addresses, not other email services. I've moved to standard managed IPs but those IPs need time to warm up. Is there anything I can do in the meantime to reduce these bounces?

asked 9 months ago669 views
1 Answer


Two things come to mind

  1. Have you setup already the domain authentication (spf, dkim, dmarc)?
  2. Do you see any issues with the domain reputation on SES dashboard, things such as a significant bounce rate from previous sending activities? This usually takes some time and actions to remediate and clear out

You can also check the IP in question against known potentially problematic IP's, see if anything comes up (example barracuda block list)

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answered 9 months ago
  • Google Postmaster tools for my domain say that the IP reputation is high, the domain reputation is high, and all the authentication stuff is working. I am using managed dedicated IPs and I believe the majority of our emails are being sent through those IPs rather than through the AWS SES shared IPs, but the bottom line is that there are some AWS SES shared IPs that Gmail is currently blocking due to spammers.

    AWS SES dashboard says our bounce rate is low and our reputation metrics are all high. However, I know that emails aer not being received by customers.

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