Cllavio is a modern email marketing and transactional email platform designed to help businesses send high-deliverability messages at scale. Built from the ground up for speed, reliability, and simplicity, Cllavio gives companies a single, unified platform where they can manage newsletters, cold email outreach, bulk campaigns, event-based automation, and transactional email through a powerful SMTP and REST API. Cllavio focuses heavily on deliverability, making sure emails reach the inbox—not the spam folder. The platform includes automatic bounce handling, throttling protection, domain reputation safeguards, and DKIM/SPF/DMARC verification to maintain sender trust. For companies sending large volumes of messages, Cllavio provides domain warmup controls, rate-limited sending, and AI-driven spam-trigger detection to optimize inbox placement over time. For marketing teams, Cllavio includes an intuitive campaign builder with templates, scheduling, A/B testing (coming soon), contact grouping, and detailed analytics for opens, clicks, and bounce rate. CSV imports are fast and support millions of rows through presigned S3 uploads, making it easy to migrate from tools like Mailchimp, Brevo, or Mailgun. For developers, Cllavio offers a clean, fully documented SMTP and JSON API, event webhooks, and real-time logs. This makes it ideal for sending order confirmations, password resets, OTPs, system alerts, receipts, and other high-priority transactional messages. The API is built for performance and is backed by scalable infrastructure powered by AWS EC2, Postfix, and cloud-native load balancing. Cllavio integrates with Shopify and other platforms to sync customer and order data automatically. It also includes domain reputation insights, delivery diagnostics, message previews, and monitoring tools to help businesses understand and improve their email performance. With a lifetime free plan, predictable pricing, and no long-term contracts, Cllavio is accessible to freelancers, startups, SMBs, and mid-market companies that want enterprise-quality email capabilities without enterprise cost or complexity. Whether you’re running marketing campaigns or powering mission-critical notifications, Cllavio gives you a fast, reliable, and developer-friendly solution to send email at scale with confidence.