Amazon EC2/SES SMTP Timeout

Question

I have an issue when trying to send emails from my EC2 instance using SMTP to SES. For some reason I am getting sporadic timeout issues, where I can no longer contact the S

Answer 1

Its looks like a case of Port 25 throttling on EC2. AWS by default throttles port 25 to avoid bulk emails being sent out by malicious users/softwares. You can get this limit removed by following the instructions here: https://aws.amazon.com/premiumsupport/knowledge-center/ec2-port-25-throttle/

Alternatively, you can change the outgoing port in your application to use 587, 2587 for STARTTLS support or use 465/2465 for TLS Wrapper.