Can we use SMTP for sending our emails (to improve code portability) ?

https://en.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol

Today `while` discussing sending emails in one of our projects the topic of sending emails from within the Azure platform came up...
_Obviously_ they don't have a _Service_ for sending emails _yet_:
https://www.google.com/webhp?q=azure+email+service
_instead_ they recommend using the Sendgrid service:
https://docs.microsoft.com/en-us/azure/app-service-web/sendgrid-dotnet-how-to-send-email

`this` project is currently using the `aws-sdk` to send email, when we _could_ use SMTP.
http://docs.aws.amazon.com/ses/latest/DeveloperGuide/send-email-smtp.html

This would help us to send email using a _different_ provider later on...
Thoughts?