Practical writing on messaging infrastructure, AI agents, and developer patterns from the team building Senddio.
AI agents that handle login or account-recovery flows need to deliver one-time codes. This post covers the right architecture — what the agent does, what stays on your server, and how to implement it correctly across SMS, email, and WhatsApp.
Resend is a polished email-only API. Senddio is a multi-channel messaging API with email as one of six channels. This comparison covers features, pricing, architecture, AI agent support, and the migration cost of getting the decision wrong.
A complete architecture for routing product events to email, SMS, Slack, or Telegram based on user preferences — with Node.js implementation, webhook handling, fallback logic, suppression, and delivery analytics.
Free plan, no credit card, all six channels.