Every Yahoo code, with the fix.
CodeRetrying or final · Who acts
- 421 4.7.0 [TS01]New or cold IP throttleRetryingSender
- 421 4.7.0 [TS02]Complaint rate deferralRetryingSender
- 421 4.7.0 [TS03]Reputation holdRetryingSender
- 421 4.7.0 [TSS04]Temporary deferralRetryingSender
- 451Unresolvable from domainRetryingReceiving server
- 554Unresolvable from domainFinalSender
- 554Unresolvable return pathFinalSender
- 554Authentication failureFinalSender
- 554 5.7.9Policy violationFinalSender
- 552 1Mailbox not foundFinalRecipient
- 554 30Disabled mailboxFinalRecipient
- 554 [PH01]Policy blockFinalSender
- 553 5.7.2 [TSS09]Permanent blockFinalSender
- 553 5.7.2 [TSS11]Permanent blockFinalSender
- 554 5.7.1 [TS06]Sender reputation blockFinalSender
- 554 5.7.1 [TS07]Content policy blockFinalSender
16 codes, 11 finalSelect a code for the full fix