Permanent Error
554

Error (Permanent Error)

What is SMTP 554?

SMTP code 554 is a permanent failure notice, indicating that the message
has been rejected and will not be delivered. Common reasons include
recipient mailboxes being unavailable or disabled, exceeded message limits,
address resolution issues, spam filtering, and policy restrictions.

The 554 response is often used for responses signify general email delivery
issues that fit within another 55x error.

Code Breakdown

Each digit in an SMTP response code carries a specific meaning.

1st digit
5

Permanent Negative

The command failed permanently. Do not retry without changes.

2nd digit
5

Mail System

Status of the mail system as a whole.

3rd digit
4

Specific Condition

The third digit narrows the response. Zero is typically generic; higher values are increasingly specific.

Response Examples

Typical server responses you may encounter.

smtp session
S: 554 5.1.1 <[email address]>: bounced address: could not resolve address [email address]
S: 554 5.2.122 The recipient has exceeded their limit for the number of messages they can receive per hour. For more information go to [Link]. [Server details]
S: 554 30 Sorry, your message to [email address] cannot be delivered. This mailbox is disabled (554.30).
S: 554 5.7.1 Your email was rejected due to Spam filtering.
S: 554 5.7.1 <[email address]>: Recipient address rejected: Access denied
S: 554 5.1.1 <[email address]>: bounced address: could not resolve address [email address]
S: 554 message rejected because the target returned error 400

Common Causes

Why you might receive this response.

1
Mailbox unavailable or disabled: The recipient's mailbox does not exist or cannot receive messages.
2
Message rate limits exceeded: The recipient has exceeded the number of messages they can receive per hour.
3
Address resolution failure: The server could not resolve the email address.
4
Spam filtering: The email has been rejected as spam or due to content or security policies.
5
Virus detection, the email may contain an attachment that has been marked as unsafe of malicious
6
Access denied: The recipient server rejected the email based on specific access or relay policies.

How to Fix This

To address a 554 error:

  • Verify the recipient's email address for accuracy, correcting any typos
    or errors.
  • If a mailbox is disabled or unavailable, contact the recipient through
    alternative means to inform them.
  • Adhere to the sending limits to avoid exceeding message rate limits.
  • Review your email content and practices to ensure compliance with spam
    and security policies.
  • For access denial issues, consult the recipient's server administrator
    or email service provider for specific policies and permissions.

Need help with email delivery?

CloudMailin can help troubleshoot and resolve SMTP issues.

Contact Support

Other SMTP Codes

2xx Success

250 Response

SMTP code 250 indicates a successful action

4xx Temporary

421 Error

SMTP code 421 indicates a temporary issue with the server that prevents it from processing requests

450 Error

SMTP code 450 is a generic temporary error and is used in a wide variety of conditions by the receiving server

451 Error

SMTP code 451 indicates a temporary local error on the receiving server

452 Error

SMTP code 452 is used to indicate that the recipient's email server is unable to accept the message due to a lack of storage space, too many recipients, or insufficient system resources

454 Error

SMTP code 454 indicates an authentication issue, typically suggesting that the server is denying relay access due to a lack of proper authentication from the sender

455 Error

SMTP code 455 is used to indicate a temporary issue with the server, where it suggests retrying the request at a later time

5xx Permanent

530 Error

SMTP code 530 typically indicates that authentication is required to proceed with the requested email operation

550 Error

SMTP code 550 is a permanent failure notice, typically indicating that the recipient's email address is invalid or unavailable

552 Error

SMTP code 552 generally indicates a failure due to storage issues or a limit imposed by the recipient's mail server

553 Error

SMTP code 553 is used to indicate a rejection due to the recipient's email address being invalid, typically in scenarios where the address is not recognized by the recipient's mail server

554 Error

SMTP code 554 is a permanent failure notice, indicating that the message has been rejected and will not be delivered

All codes