Email API benchmarks
Hey HN, I'm Chris, CTO of Knock (https://knock.app). We built email.info because every developer we talk to asks the same question: which email provider should I use? The existing resources are mostly vibes — "Best of" listicles, anonymous Reddit threads, or LLM answers trained on that same content. Objective performance data is always missing. Knock is a notification infrastructure platform, so we send billions of API requests to downstream email providers every year. We aggregated that data into a public dashboard covering 10 providers (SendGrid, Postmark, Resend, Mailgun, Amazon…
Email API benchmarks launched on March 12, 2026 with 113 votes, #374 of 23,380 launches that month and more than 95% of that year's launches.
What it does
Today we're releasing email API benchmarks, a real-time dashboard of email provider performance to help you compare and choose. The dashboard is powered by the billions of API requests Knock sends to downstream providers like SendGrid, Resend, Postmark, and more. We've aggregated this data to highlight important metrics (like response time and error rate) to help you compare email providers, not based on hype, but on their real-world performance data.
Real-time email API benchmarks powered by proprietary data from billions of messages. Compare response time, error rates, reliability, and uptime for SendGrid, Postmark, Amazon SES, and more.
Real-time performance, reliability, and uptime benchmarks for top email providers, powered by proprietary data from billions of messages sent through Knock. Sort and filter providers by response time, error rate, delivery speed, and growth. Pick any two providers for a head-to-head comparison of performance, reliability, and pricing. Explore detailed performance benchmarks, feature comparisons, and pricing for each provider. Send high-volume email on AWS with API or SMTP and keep costs predictable as you scale. Send transactional email and SMS from one stack with receipts, resets, and alerts, plus templates your team can edit without code. Send, validate, and parse inbound mail with APIs so…from knock.app
In the maker’s words, at launch
Hey HN, I'm Chris, CTO of Knock (https://knock.app). We built email.info because every developer we talk to asks the same question: which email provider should I use? The existing resources are mostly vibes — "Best of" listicles, anonymous Reddit threads, or LLM answers trained on that same content.…
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