Lettr

Lettr is an email platform designed for SaaS teams that need to manage both transactional and marketing communications. Developers can connect their applications through a REST API, SMTP relay, or language-specific SDKs, then use webhooks to respond to delivery, open, and click events. The platform supports triggered messages such as welcome emails, password resets, security alerts, and trial reminders, alongside campaigns, newsletters, and multilingual sends.

Lettr gives developers and marketers a shared visual editor, dashboard, and billing account. Teams can build templates with drag-and-drop tools, use dynamic placeholders, maintain shared sections across emails, and manage translations and version history. Campaign tools include contact lists, segments, scheduling, and analytics for tracking email performance. Deliverability features include SPF, DKIM, and DMARC support, while multi-region sending uses nearby data centers.

Lettr offers integrations and quickstarts for technologies including Laravel, Node.js, Go, Java, and Rust, and its REST API can be used with other HTTP-capable languages.