Notification & Email Delivery MCP Servers — Twilio, Resend, SendGrid, Mailgun, Postmark, Infobip, Courier, and Beyond

The notification and email delivery MCP category spans four distinct use cases: transactional email (Resend, Mailgun, Postmark, SendGrid), SMS and telephony (Twilio, Infobip, Telnyx, Vonage), multi-channel notification orchestration (Courier, Novu, I...