Unitpost
An email-sending service built for developers: plug in an API key or SMTP details and send both automated receipts and marketing campaigns without paying per contact.
🔗 Visit Unitpost
Description
Sending email from an app sounds simple until you actually need it to land in the inbox reliably — that's the problem services like Unitpost solve: they're the delivery truck that takes your password-reset emails, receipts, and newsletters and makes sure they actually arrive, instead of you having to run your own mail server and beg every inbox provider to trust it.
Unitpost specifically targets developers and AI-agent builders, offering a REST API, language SDKs, an SMTP relay, and even an MCP server so AI assistants can send email as a tool call. Its pricing is a flat per-send model rather than the common per-contact fee structure: a free plan covers 5,000 emails/month capped at 200/day, and paid tiers run from $10/month (20k emails) up to $800/month (1M emails), with enterprise plans above that. It handles both transactional email (receipts, password resets, alerts) and marketing sends from the same infrastructure, with webhook-based delivery, bounce, open, and click tracking included. What's thinner is the public documentation on deliverability specifics like dedicated IP management and sender reputation tooling, which matters more as volume grows.
💬 Our review
The short version: if you're a developer tired of per-contact pricing on email tools, Unitpost's flat per-send model and free tier are worth a look, but the free tier's 200/day cap means you'll outgrow it fast on anything beyond a side project.
Against established players like SendGrid, Mailgun, and Postmark, Unitpost's pitch is developer-first simplicity (API, SDKs, SMTP, and even an MCP server for AI agents) plus pricing that doesn't punish you for having a big contact list. That's a real advantage if your sends are frequent but your audience is large and mostly one-time. What's missing compared to the bigger names is public detail on dedicated IP warm-up, sender reputation management, and compliance certifications — the operational stuff that matters once you're sending real volume. For early-stage apps and small teams, the free tier and clear pricing make it easy to try; for anything sending regulated or high-volume mail, ask about deliverability infrastructure before committing.
💰 Pricing
📊 Global score
🤖 AI-enriched data
Gratuit : 5 000 emails/mois (plafond 200/jour). Starter : 10-80 $/mois (20k-125k emails/mois). Growth : 200-800 $/mois (250k-1M emails/mois). Enterprise sur devis.
Pros
Tarification au volume d'envoi, pas au nombre de contacts
Multiples méthodes d'intégration : API, SDKs, SMTP, serveur MCP pour agents IA
Suivi des événements (livraison, bounces, ouvertures, clics) inclus via webhooks
Cons
Palier gratuit plafonné à 200 emails/jour, vite limitant
Peu de documentation publique sur la gestion des IP dédiées et la réputation d'envoi
Aucune certification de conformité ou SLA public mentionné