Debug Your Infrastructure

Get Instant Solutions for Kubernetes, Databases, Docker and more

AWS CloudWatch
Thank you! Your submission has been received!
Oops! Something went wrong while submitting the form.
Pod Stuck in CrashLoopBackOff
Database connection timeout
Docker Container won't Start
Kubernetes ingress not working
Redis connection refused
CI/CD pipeline failing

Mailgun 550 Sender address rejected

The sender's email address is not authorized to send emails.

Resolving the '550 Sender address rejected' Error in Mailgun

Understanding Mailgun

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.

Identifying the Symptom

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.

What You Observe

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.

Explaining the Issue

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.

Root Cause Analysis

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.

Steps to Fix the Issue

To resolve the '550 Sender address rejected' error, follow these steps:

Step 1: Verify Domain in Mailgun

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.

Step 2: Check DNS Records

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.

Step 3: Authorize the Sender Address

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.

Step 4: Test Email Sending

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.

Conclusion

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.

Master 

Mailgun 550 Sender address rejected

 debugging in Minutes

— Grab the Ultimate Cheatsheet

(Perfect for DevOps & SREs)

Most-used commands
Real-world configs/examples
Handy troubleshooting shortcuts
Your email is safe with us. No spam, ever.

Thankyou for your submission

We have sent the cheatsheet on your email!
Oops! Something went wrong while submitting the form.

Heading

Cheatsheet

(Perfect for DevOps & SREs)

Most-used commands
Your email is safe thing.

Thankyou for your submission

We have sent the cheatsheet on your email!
Oops! Something went wrong while submitting the form.

MORE ISSUES

Deep Sea Tech Inc. — Made with ❤️ in Bangalore & San Francisco 🏢

Doctor Droid