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Hello.
As mentioned in the comments in the document below, we do not recommend applying to remove the restriction on port 25 in AWS because the hurdles to approval are high.
https://repost.aws/knowledge-center/ec2-port-25-throttle#COV8eEPhyHTmGB3TZNPJyPFg
I recommend using Amazon SES to send emails instead.
Amazon SES also requires an application for production access, but I think the hurdle is lower than lifting the restriction on port 25.
https://docs.aws.amazon.com/ses/latest/dg/request-production-access.html
