How Do I Fix SMTP 550 Relay Not Permitted Issue?

You may come across several errors while using a webmail application. The SMTP 550 relay not permitted issue is one among them.One main reason for this error could be misconfigured authentication of the SMTP server. Learn how to solve the SMTP error by following the simple steps given below.

Step 1: Most of the time, the error SMTP error 550 relay not permitted occurs if the recipient’s email address fails to reach the SMTP server.
Step 2: This error can also happen if:
Step 3: The email client account is misconfigured.
Step 4: The wrong credentials are entered during the setup.
Step 5: The email client fails to select the right protocol while sending an email message.

The best and most recommended way to solve this issue is to reconfigure your email client account settings. Now, try these solutions to solve the SMTP 550 relay not permitted issue.

Step 1: First, check your email account’s authentication.

Step 2: Some email clients ask you to enter your username and password for login, while several other clients ask you to connect to the POP3 protocol.

Step 3: Based on your account’s authentication, perform the prompted process correctly.

Step 4: After that, navigate to the SMTP account setup process.

Step 5: Most of the email clients offer the autodiscover or autodetect option for easy configuration.

Step 6: If the autodiscover or autodetect option does not help, try to configure your SMTP authentication process manually.

Step 7: The manual configuration process may solve this issue.

Step 8: If you still receive the SMTP 550 Relay not permitted message, check the SMTP port.

Step 9: Port number 25 is used as the standard SMTP port.

Step 10: If required, you can configure the SMTP services for other ports, such as 587, 465, and 2525.

Step 11: But, make sure that the selected port number is not blocked by your computer’s firewall feature.

Step 12: If you have enabled the IP Address filtering option, then there is a chance for this error to occur while sending an email message from a specific location.

Step 13: For example, you can send the email message from your home but not from work.

Step 14: The reason behind this SMTP 550 relay not permitted issue is a firewall. By default, most of the firewall features are designed to block the SMTP traffic to prevent your email account from spam.

Step 15: Re-configure the firewall settings correctly to avoid these kinds of errors.