Sander shows you how to
remove the throttle on port 25
from your EC2 instance


I'm having trouble sending email over port 25 of my Amazon EC2 instance, or I'm getting frequent timeout errors. How do I remove the port 25 throttle on my EC2 instance?

Amazon EC2 throttles traffic on port 25 of all EC2 instances by default, but you can request that this throttle be removed.

Note: If you want AWS to create a reverse DNS record for you, you must first create a corresponding DNS A record before submitting this form. If you're using Amazon Route 53 as your DNS service, create a new resource record set that includes an A record or update your existing resource record set to include a new A record. If you're using a service other than Amazon Route 53, ask your DNS provider to create an A record for you.

  1. Sign in with your root account credentials and open the Request to Remove Email Sending Limitations form.
  2. In the Use Case Description field, provide a description of your use case.
  3. (Optional) Provide the AWS-owned Elastic IP addresses that you use to send outbound email, as well as any reverse DNS records AWS needs to associate with the Elastic IP addresses. AWS will use this information to help reduce the chance that email sent from the Elastic IP addresses is marked as spam.
  4. Choose Submit.

If your request is approved, you'll receive email to notify you that the port 25 blocks on your EC2 instances have been removed.

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Published: 2016-02-19