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Yahoo is blocking my email

Yahoo Mail rarely rejects mail upon connection. If your email is being rejected, you'll see these error messages in your SMTP logs:

  • 553 VS99-IP1 deferred - see related help topic. If you see this error message, please visit this page for assistance.
  • 451 VS1-IP Excessive unknown recipients - possible Open Relay More information (#4.1.8)
  • 451 VS1-MF Excessive unknown recipients - possible Open Relay More information(#4.4.5)

If you're receiving the above error messages, visit our deprioritization page for more information.

If you don't see error messages similar to the above, then your emails are neither being blocked nor deprioritized. Other delivery related error messages you may receive are listed below:

  • 554 delivery error: dd This user doesn't have a yahoo.com account ({recipients'userid}@yahoo.com). Don't retry sending the message and remove the email address from your list. The user doesn't exist.
  • 421 Resources temporarily unavailable. Please try again later. The Yahoo Mail MTAs are temporarily too busy. Your server should try to resend the message after a few minutes.

If you don't see these or similar error messages, you should see an SMTP confirmation code similar to "250 ok dirdel" that indicates your message has been delivered.