Just found the solution here: https://forum.cloudron.io/topic/1279/receive-email/4
The problem was that AWS EC2 instances close port 25 by default. As soon as I opened it in the AWS console, I was able to receive emails.
Just found the solution here: https://forum.cloudron.io/topic/1279/receive-email/4
The problem was that AWS EC2 instances close port 25 by default. As soon as I opened it in the AWS console, I was able to receive emails.