Claude Code picked Resend in 88% of TypeScript email API tests, study finds

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AgentAnalytics ran 64 automated attempts using Claude Code to implement transactional email features across four common SaaS tasks, requiring the AI agent to research providers independently before each attempt. Resend was selected in 56 of 64 runs and passed all available validators, while Postmark was chosen in the remaining eight attempts, all for delivery webhook tasks. Seven of those eight Postmark implementations failed a provider-specific authentication check due to reliance on HMAC signature verification that Postmark's own documentation does not support. The study found that Claude's decisions were heavily shaped by third-party comparison pages, as 93% of search results were comparison sites and no provider documentation page was directly fetched. Researchers noted the results reflect one model, one task family, and one retrieval setup, and do not constitute a general ranking of email provider capabilities.

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