553 sorry, that domain isn't in my list of allowed rcpthosts ...

May 3, 2019

Welcome to AdAbler's knowledge base, where we provide expert information on various topics related to the Business and Consumer Services - Marketing and Advertising industry. In this article, we'll explore the meaning behind the '553 sorry, that domain isn't in my list of allowed rcpthosts ...' error message that often occurs when an email message bounces back to the sender.

Understanding the 553 Error

The '553 sorry, that domain isn't in my list of allowed rcpthosts ...' error is a common SMTP (Simple Mail Transfer Protocol) error that indicates an issue with email delivery. When this error message appears, it means that the recipient's mail server has rejected the email due to a restriction or configuration problem.

This error typically occurs when the mail server responsible for handling incoming emails cannot verify the authenticity or validity of the sender's domain. It checks its list of allowed rcpthosts (recipient hosts) and determines that the sender's domain is not included in the list. As a result, the email gets bounced back to the sender with the 553 error message.

Causes of the 553 Error

Several factors can contribute to the occurrence of the '553 sorry, that domain isn't in my list of allowed rcpthosts ...' error:

  1. Inaccurate or missing recipient domain: The most common reason for this error is when the recipient domain in the email address is incorrect or misspelled. Double-checking the recipient's email address for any mistakes is crucial in avoiding this error.
  2. Sender domain not whitelisted: Some mail servers implement strict spam filters and security measures to prevent unsolicited emails. If the sender's domain is not on the recipient's whitelist or allowed senders list, the email may be rejected with the 553 error.
  3. Sender's IP address reputation: In some cases, the reputation of the IP address associated with the sender's domain can impact email delivery. If the IP address has a poor reputation (e.g., flagged as a source of spam), the recipient's mail server may reject the email with the 553 error.

Resolving the 553 Error

To fix the '553 sorry, that domain isn't in my list of allowed rcpthosts ...' error and ensure successful email delivery, consider the following steps:

  1. Double-check recipient's email address: Verify that the recipient's email address is accurate and free of any typos or misspellings. Ensure that the domain portion of the email address reflects the intended recipient's domain.
  2. Confirm sender's domain inclusion: If you're the sender, reach out to the recipient or their system administrator to request that your domain be added to their list of allowed rcpthosts. This will ensure that future emails from your domain are not rejected.
  3. Improve sender domain reputation: If your IP address has a poor reputation, take necessary actions to improve it. This may involve addressing any spam-related issues, ensuring compliance with email marketing regulations, or working with your email service provider to resolve any problems.


In summary, the '553 sorry, that domain isn't in my list of allowed rcpthosts ...' error message can be frustrating and confusing for both senders and recipients. However, by understanding the causes and implementing the appropriate solutions, you can overcome this email delivery obstacle and ensure successful communication.

At AdAbler, we specialize in providing insights and solutions for various challenges faced by businesses in the Marketing and Advertising industry. We hope this article has shed light on the '553 sorry, that domain isn't in my list of allowed rcpthosts ...' error and provided you with the information you need to resolve it.

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