Elascticemail integration

[neo22s]

I think it's the cheapest transactional email in the market 

https://github.com/ElasticEmail/ElasticEmail.WebApiClient-php

https://elasticemail.com/api-pricing

[joshuafranks]

There's already an open PR which seeks to add support for ElasticEmail; we'll be reviewing it internally tomorrow.

[neo22s]

congrats guys!!