Email · October 2026
Postmark vs Amazon SES: which do AI models pick?
Postmark leads on being recommended first (37% vs 2%). Postmark and Amazon SES are about even on being installed in AI-built apps (0% vs 0%).
PostmarkAmazon SES
| Postmark | Amazon SES | |
|---|---|---|
| Rank among email tools recommended first | #2 of 3 | #3 of 3 |
| Rank in AI-built apps | not ranked | not ranked |
| More detail | Postmark page | Amazon SES page |
Based on 180 recommendation answers and 120 AI-built apps. Differences under about 7 points are within noise.
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Measured 2026-10-01 with claude-sonnet-5.5, gpt-6.1-sol, gemini-3.8-flash, grok-4.7, deepseek-v4.1-flash, qwen3.8-max-prime, 5 runs per recommendation prompt and 5 per build prompt, via public APIs with no system prompt. Methodology. DefaultRank is independent and not affiliated with any tool vendor or model provider.