Subject: Mail delivery failed: returning message to sender

Asked Aug 05 '20 at 19:41

Active Aug 05 '20 at 19:41

Viewed 79 times

I was install mail server by open source panel like vestacp on aws ec2 but don't send or receive

Subject: Mail delivery failed: returning message to sender
This message was created automatically by mail delivery software.

asked Aug 05 '20 at 19:41

Ahmed Az

It might be due to the fact that port 25 is throttled on Amazon EC2 instances to prevent email servers sending spam. See: [Remove the Port 25 Restriction From Your EC2 Instance](https://aws.amazon.com/premiumsupport/knowledge-center/ec2-port-25-throttle/) – John Rotenstein Aug 05 '20 at 23:20
StackOverflow is for Programming Q&A. You might get a better response for this question on: https://serverfault.com/ – John Rotenstein Aug 05 '20 at 23:21

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