What is the google smtp service similar to amazon ses, is it gmail smtp? I have used amazon ses smtp for sending marketing emails, by configuring in my server. So google has similar service, or is it same as smtp.gmail.com?
Google Cloud does not offer a service similar to Amazon SES.
If your goal is to send promotional, marketing or newsletter type emails, use a service such as MailChimp or SendGrid.
If your goal is to send emails as part of your service to internal users or a small number of select users, use a service such as Gmail, G Suite or Office 365.