Outgoing email using third-party server

Question

Hi there,

I wanna configure outgoing emails in aws using third party server. I don't which firewall I should use for amazon linux 2023
I am trying to use port 465 not 25 and third party mail server to send emails but I am not able to connect on port 465 out from our server
thanks

Answer

Set the port number to be used for sending mail on the third-party mail server in the outbound rule of the EC2 security group.  
https://docs.aws.amazon.com/vpc/latest/userguide/security-group-rules.html#working-with-security-group-rules

In addition, if you wish to use port 25 for sending emails, you must apply to AWS for deactivation by following the procedure in the following document.  
https://repost.aws/knowledge-center/ec2-port-25-throttle

Outgoing email using third-party server

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