At the core I will be building an API that hooks straight into an IMAP server. So instead of making an IMAP call from your application you make a much faster AP

At the core I will be building an API that hooks straight into an IMAP server. So instead of making an IMAP call from your application you make a much faster API call. I always thought that Sendgrid was a transactional email service, not so much a business oriented and more full featured email server. This would make building new applications that use email as a feature much faster to build because you only have one endpoint to hit.