Error: "421 4.7.1 [TS03] All messages from x.x.x.x permanently deferred" when sending email to Yahoo

If your IP address is being used to send a high volume of email, you'll get this error (where x.x.x.x is your IP address). This is usually related to unsolicited, bulk emailing.

Our suggestions

  • Don't resend until you check your subscription practices and lists to make sure emails are only sent to recipients that have requested them.
  • If you're an administrator for message content or mailing policy and you've made significant changes, or you've received this error for more than 48 hours, we ask that you review your outgoing emails for objectionable content or practices. Review our best practices for senders to learn how you can help your emails reach Yahoo Mail.
  • If you're not the administrator of the mail server in question, we suggest you contact the administrator.

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