Email provider · 5.x.x permanent failure
Every SMTP 554 response on record from Yahoo Inc (yahoo.com, aol.com, verizon.net), with the verbatim text, the enhanced status code, a severity rating and a plain-English fix.
The transaction failed with no more specific reason offered. In practice the receiver is saying the message is unwanted: a spam verdict, a blocklisted IP, or a policy rejection. The accompanying text is where the detail is.
smtp;554 delivery error: dd This user doesn't have a example.com account ([email protected]) [-9] - example.yahoo.com
The receiver refused the message for good and points at a protocol problem (a malformed or out-of-sequence SMTP command) (enhanced status 5.5.4). Use the wording above to pin down the exact fix.
Provider documentation
smtp;554 delivery error: dd Sorry, your message to [email protected] cannot be delivered. This mailbox is disabled (554.30). - example.yahoo.com
The receiver refused the message for good and points at a protocol problem (a malformed or out-of-sequence SMTP command) (enhanced status 5.5.4-1). Use the wording above to pin down the exact fix.
Provider documentation
smtp;554 delivery error: dd Requested mail action aborted - example.yahoo.com
The receiver refused the message for good and points at a protocol problem (a malformed or out-of-sequence SMTP command) (enhanced status 5.5.4-2). Use the wording above to pin down the exact fix.
Provider documentation
smtp;554 5.7.9 Message not accepted for policy reasons. See https://postmaster.yahooinc.com/error-codes
The receiver rejected the message under a policy rule rather than a content or reputation score. This is usually set by the recipient's mail admin, so ask the recipient to allowlist your sending address or domain.
Provider documentation
smtp;554 Message not allowed - [PH01] Email not accepted for policy reasons. Please visit https://postmaster.yahooinc.com/error-codes
The receiver rejected the message under a policy rule rather than a content or reputation score. This is usually set by the recipient's mail admin, so ask the recipient to allowlist your sending address or domain.
smtp;554 Message not allowed - Headers are not RFC compliant[291]
The receiver refused the message for good and points at a protocol problem (a malformed or out-of-sequence SMTP command) (enhanced status 5.5.4-4). Use the wording above to pin down the exact fix.
Provider documentation
smtp;554 Message not allowed - [299]
The receiver refused the message for good and points at a protocol problem (a malformed or out-of-sequence SMTP command) (enhanced status 5.5.4-5). Use the wording above to pin down the exact fix.
Provider documentation
smtp;554 delivery error: dd [email protected] is no longer valid. [-20] - example.yahoo.com
The receiver refused the message for good and points at a protocol problem (a malformed or out-of-sequence SMTP command) (enhanced status 5.5.4-6). Use the wording above to pin down the exact fix.
Provider documentation
Postmaster & documentation
The transaction failed with no more specific reason offered. In practice the receiver is saying the message is unwanted: a spam verdict, a blocklisted IP, or a policy rejection. The accompanying text is where the detail is. At Yahoo Inc, it is a permanent rejection, and the specific reason is in the enhanced status code and message text of each response below.
Match your bounce text to one of the responses below and follow its guidance. Recipient-side wording means fix the address. Authentication or reputation wording (SPF, DKIM, DMARC, blocklist) means fix your sending setup, and check Yahoo Inc's postmaster documentation.
