Introduction
By default, Amazon blocks port 25 outbound on EC2 instances. As a result, email will be unable to be sent outbound unless a smart host is configured.
Procedure
You can use the following link to send a request to Amazon to lift the restriction on port 25:
How do I remove the restriction on port 25 from my EC2 instance?
Additional Information
Many providers block port 25 by default to prevent spam from being sent from their servers:
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