5.x.x permanent failure
SMTP Error Code 553: Meaning, Causes and How to Fix It
SMTP 553 is a permanent failure.
The mailbox name is not allowed, usually because the address is malformed, the domain is wrong, or the receiver will not accept mail addressed that way.
- Class
- 5xx permanent
- Bounce type
- Hard bounce
- Highest severity
- Medium
- Responses on record
- 6
Email Security.cloud
Google
Yahoo Inc
ZohoSMTP 553 responses from email providers
How mailbox providers phrase a 553. Open a provider for the full text, severity and fix for every variation.
Google1 response
Yahoo Inc2 responses
host xx.yahoodns.net [x.xx.xx.xx] SMTP error from remote mail server after MAIL FROM:<[email protected]> SIZE=2022: 553 5.7.1 [BL21] Connections will not be accepted from x.xx.xx.xx, because the ip is in Spamhaus's list; see http://postmaster.yahoo.com/550-bl23.html
host xx.yahoodns.net [x.xx.xx.xx] SMTP error from remote mail server after MAIL FROM:<[email protected]> SIZE=2022: 553 Mail from x.xx.xx.xx not allowed - 5.7.1 [BL23] Connections not accepted from IP addresses on Spamhaus XBL; see http://postmaster.yahoo.com/errors/550-bl23.html [550]
SMTP 553 responses from spam filters
How spam-filtering gateways phrase a 553 rejection.
Email Security.cloud2 responses
smtp;553 Message filtered. Refer to the Troubleshooting page at http://www.symanteccloud.com/troubleshooting for more information. (#5.7.1)
smtp;553 you are trying to use me [xx.messagelabs.com] as a relay, but I have not been configured to let you [x.xx.xx.xx, example.com] do this. Please visit www.symanteccloud.com/troubleshooting for more details about this error message and instructions to resolve this issue. (#5.7.1)
SMTP 553 questions
›Is SMTP 553 a hard bounce or a soft bounce?
It is a permanent failure, so a hard bounce. The receiving server will not accept the same message on a retry, and the address or the sending problem has to be fixed before you resend.
›What causes an SMTP 553 error?
The mailbox name is not allowed, usually because the address is malformed, the domain is wrong, or the receiver will not accept mail addressed that way. The exact reason varies by receiver, which is why this page lists the specific 553 responses recorded for Email Security.cloud, Google, Yahoo Inc, Zoho.
›How do I fix an SMTP 553 bounce?
Read the enhanced status code and the message text, not just the number. Wording that names the recipient (user unknown, mailbox unavailable) means correct or remove the address. Wording that names authentication or reputation (SPF, DKIM, DMARC, blocklist) means fix that on the sending side, or clear the listing. Every response on this page has its own guidance.