SMTP Error 534:

What does it mean? And How to resolve this error.

Table of content

Error Description

SMTP error 534 is a permanent or "5xx" error code returned by a mail server to indicate that the server has rejected an email message due to authentication failure or insufficient credentials. This error signifies that the sender's email client or server did not provide valid authentication information or that the provided credentials were insufficient to send the email.

What's Causing This Error?

SMTP error 534 can be caused by several reasons, including:

Incorrect or incomplete credentials: The sender's email client or server provided incorrect or incomplete login credentials when attempting to authenticate with the recipient server.
Insufficient permissions: The sender's account does not have the necessary permissions or privileges to send email through the recipient server.
Authentication mechanism issues: The recipient server may require specific authentication methods (e.g., SMTP-AUTH) that are not being used or configured correctly.
Suspended or locked account: The sender's email account with the recipient server may be suspended, locked, or restricted from sending email.

How to fix SMTP Error 534?

Verify authentication credentials: Ensure that the username and password provided for SMTP authentication are correct, complete, and correspond to a valid sender account.
Check permissions: Ensure that the sender's account has the necessary permissions to send email through the recipient server. Contact the email administrator if needed.
Configure authentication correctly: If the recipient server requires specific authentication methods, configure your email client or server to use the appropriate mechanisms, such as SMTP-AUTH.
Address account issues: If your email account is suspended, locked, or restricted, contact the email administrator or hosting provider to resolve the account-related issues.

SMTP Error 534 Examples

Example 1: "534 5.7.0 Authentication failed. Please check your username and password."

Example 2: "534 5.7.3 Insufficient permissions to send email. Contact administrator for access."

Example 3: "534 5.7.1 Incorrect authentication mechanism. Use SMTP-AUTH for secure login."

Example 4: "534 5.5.0 Account locked. Email sending is temporarily restricted."

SMTP

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