SMTP code 530 typically indicates that authentication is required to
proceed with the requested email operation.
This error often occurs when a client attempts to perform actions that
require a logged-in session or valid credentials, without being
authenticated first.
It may also occur
if STARTTLS is required before beginning authentication.
Each digit in an SMTP response code carries a specific meaning.
Permanent Negative
The command failed permanently. Do not retry without changes.
Unspecified
Unspecified — applies to various situations.
Specific Condition
The third digit narrows the response. Zero is typically generic; higher values are increasingly specific.
Typical server responses you may encounter.
530 5.7.1 Authentication required
530 5.7.0 Must issue a STARTTLS command first
530 5.5.1 Authentication Required. For more information, visit Can't sign in to your Google Account.
530 5.7.0 Must issue a STARTTLS command first.
Why you might receive this response.
To resolve a 530 error:
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CloudMailin can help troubleshoot and resolve SMTP issues.
SMTP code 421 indicates a temporary issue with the server that prevents it from processing requests
SMTP code 450 is a generic temporary error and is used in a wide variety of conditions by the receiving server
SMTP code 451 indicates a temporary local error on the receiving server
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
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
SMTP code 455 is used to indicate a temporary issue with the server, where it suggests retrying the request at a later time
SMTP code 530 typically indicates that authentication is required to proceed with the requested email operation
SMTP code 550 is a permanent failure notice, typically indicating that the recipient's email address is invalid or unavailable
SMTP code 552 generally indicates a failure due to storage issues or a limit imposed by the recipient's mail server
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
SMTP code 554 is a permanent failure notice, indicating that the message has been rejected and will not be delivered