Hosting webapp on an AWS EC2 server. Do I need to use the AWS "application services" for search and email?

I want to host my app on an VPS/VPC and am currently leaning towards the AWS EC2 server. I'm looking at the console right now and I see a bunch of services offered like CloudSearch(managed search service) and SES(email sending service).

Considering the fact that I have already written code to do these things (at least for the search) that works locally, do I/should I still utilize these services? If so, why and how?