Hello Sir/Madam,
Greetings of the day..! Hope you are doing well.
"ALEXA"
I have gone through your requirement details and understood it completely. We will use EC2 machine with public IP for setting up PHP apache mysql , where your php code will run. For subdomain setup you need to use EC2 IP in your name server. My last project was about using SES, lambda, S3 services in aws can check from reviews.
I have following areas of expertize:
>>Php5, PHP7, Python2, Python3
>>Laravel, Codeigniter, Django
>>Aws EC2, SES, Lambda, RDS, S3.
>>Unix, Apache, Nginx, SSL, Postfix SMTP