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Mailgun is a powerful Email Communication API provider that allows developers to send, receive, and track emails effortlessly. It is widely used for its robust features and ease of integration into applications, making it a popular choice for businesses looking to manage their email communications effectively.
When using Mailgun, you might encounter the error message: "550 Sender address rejected". This error typically occurs when an email fails to be delivered, and the sender receives a bounce-back message indicating that the sender's address was rejected.
The primary symptom of this issue is the inability to send emails from a specific sender address, accompanied by the error code 550 in the bounce-back message.
The 550 Sender address rejected error is a common issue that arises when the sender's email address is not authorized to send emails through the Mailgun service. This can happen if the sender's domain has not been properly verified or if there are issues with the domain's DNS settings.
The root cause of this error is often related to the sender's email address not being recognized as a valid sender by Mailgun. This can be due to missing or incorrect DNS records, or the domain not being verified in the Mailgun dashboard.
To resolve the '550 Sender address rejected' error, follow these steps:
Ensure that your domain is verified in the Mailgun dashboard. Log in to your Mailgun account and navigate to the Domains section. Check if your domain is listed and verified. If not, follow the instructions to verify your domain.
Verify that the necessary DNS records are correctly set up for your domain. This includes the SPF, DKIM, and MX records. You can find the required DNS settings in the Mailgun dashboard under the domain settings. Use a DNS lookup tool like MXToolbox to confirm that your DNS records are correctly configured.
If the sender's email address is not authorized, add it to the list of authorized senders in your Mailgun account. This can be done by navigating to the domain settings and adding the email address under the authorized senders section.
After making the necessary changes, test sending an email from the previously rejected sender address. Ensure that the email is sent successfully without encountering the 550 error.
By following these steps, you should be able to resolve the '550 Sender address rejected' error in Mailgun. Ensuring that your domain is verified and DNS records are correctly configured is crucial for successful email delivery. For more detailed guidance, refer to the Mailgun Documentation.
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