Migrate TE email service to sendgrid

Currently TE emails are sent from an internal email service only accessible by development and without significant expansion capabilities. We would like to explore the possibility of migrating these emails to get sent via Sendgrid for a number of reasons. Firstly the ability for support to look up emails and confirm if they were sent, blocked, delivered, etc would help with many day to day requests. This migration would also allow for greater customization of these emails to more easily send updates, change wording, and add instructions ie how to download merchant statements to view as opposed to simply notifying they are available. Additionally, I think this could also contribute to the automation of chargeback notices being sent which is a significant drain on TE support resources.