Support HTTP and custom port in SES

[yaitskov]

Hi,

My app is using Aws for sending emails.
I am trying to run this feature locally with localstack project, which emulates AWS services locally. I don't want to keep HTTPS certificate and worry about port 433.
I realized that SES doesn't allow configuration of such parameters.

[yaitskov]

#273

Could you have a look, @aristidb?