Both Resend and Postject are developer-first email APIs built for modern applications. If you're evaluating them, here's an honest comparison to help you decide.

What they have in common

Both platforms share core strengths:

Clean REST APIs designed for developers
Domain authentication with SPF, DKIM, and DMARC
Webhook events for delivery tracking
Free tiers for testing and development
Modern dashboard interfaces

Where Postject pulls ahead

Inbox placement visibility

Postject includes inbox placement tracking that shows where your emails land -- inbox, spam, or promotions. Resend doesn't currently offer this. For teams that care about deliverability (and you should), this is a significant advantage.

Content analysis

Before sending, Postject analyzes your email content for spam triggers, HTML quality, and link safety. You get a score and actionable recommendations. This pre-send check prevents deliverability issues before they happen.

Multi-IP routing

Postject offers configurable IP pools for reputation isolation. If you send both transactional and marketing emails, you can route them through different IPs to protect your transactional delivery rates. Resend uses shared infrastructure.

AI assistant integration

Postject's MCP server provides 17 tools that connect AI assistants like Claude, Cursor, and Windsurf directly to your email infrastructure. Manage emails, check analytics, and audit deliverability from your AI coding environment.

Regional pricing

Postject offers pricing in NGN, GBP, and USD with local payment processing through Paystack (Nigeria) and Stripe (international). Resend currently only prices in USD.

Where Resend has advantages

React Email integration

Resend created React Email, a library for building emails with React components. If you're already in the React ecosystem and want component-based email templates, this is a nice integration. Postject uses JSON variable templates, which work across any framework.

Pricing comparison

Both offer free tiers with 100 emails/day. At scale:

50K emails: Postject Pro at $19/mo vs Resend Pro at $20/mo
Enterprise: Postject at $120/mo for 500K emails vs Resend custom pricing

Postject includes inbox placement visibility and content analysis at every tier -- features Resend doesn't offer at any price.

The verdict

Choose Postject if you want comprehensive deliverability tools, multi-IP routing, AI integration, or regional pricing. Choose Resend if React Email integration is essential to your workflow.

For most developer teams, Postject offers more value at comparable or lower prices, especially when deliverability matters.