HandySends is an email marketing service that focuses on deliverability, scalability, and support. They offer 24/7 support and technical expertise to ensure that marketing and business-critical emails are safely delivered to clients' inboxes. They have partnered with Twillo SendGrid to provide a powerful email communication platform with easy segmentation, campaign editing, and actionable analytics. HandySends also offers SMTP relay setup and flexible APIs for customizable integration, as well as tools for secure email delivery.