Basic integration with SendGrid v3 API.
Works with SendGrid free tier account.
Has an API key and a mail account setup to test sending mail with plain text, formatted text or html. Attachments are currently limited to JPEG, PNG, PDF, XLS/XLSX and FMP12. Fits iPhone 6s screen size and larger.
v1.1 Added support for Sandbox Mode and Silent Bcc. Removed some unnecessary quotation in calculations and changed message body from JSONString to JSONRaw.