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Mailgun vs ZeroBounce

ZeroBounce scores higher on the AgentReady, 62/100 against 58/100. They differ on 8 of the 41 signals. Which ones decides whether an agent can adopt them without a person watching.

What each one is

Mailgun. Transactional Email Delivery Service & API for Developers.

ZeroBounce. ZeroBounce is an email verification and deliverability platform that helps users verify emails, clean lists, build sender reputation, and monitor inbox health.

Where Mailgun is ahead

Mailgun passes authentication documented, and ZeroBounce does not. That is understand, whether an agent can read the docs and work out how the API behaves before calling it.

It also holds adopt: agent-compatible signup flow. ZeroBounce misses it.

And on operate, agent compatibility verified. ZeroBounce misses it.

Where ZeroBounce is ahead

ZeroBounce passes public docs discoverable, llms.txt published and llms-full.txt / full agent docs, and Mailgun does not. That is discover, whether an agent can find the product at all without being told it exists.

It also holds understand: structured api reference. Mailgun misses it.

And on adopt, no mandatory sales call. Mailgun misses it.

What neither does

Both fail openapi / spec quality, request examples provided, response examples provided, errors and status codes documented, limits / constraints documented, programmatic credential creation, cli available, structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable. If your agent needs any of those, you will be building it yourself either way.

Score, pillar by pillar

The AgentReady splits into four pillars, scored separately, because a product can be easy to find and still impossible to adopt.

Discover is whether an agent can find the product at all without being told it exists. ZeroBounce leads 100 to 73. Mailgun misses public docs discoverable, llms.txt published, llms-full.txt / full agent docs; ZeroBounce misses nothing.

Understand. ZeroBounce leads 38 to 31. Mailgun misses structured api reference, openapi / spec quality, request examples provided, response examples provided, errors and status codes documented, limits / constraints documented; ZeroBounce misses openapi / spec quality, authentication documented, request examples provided, response examples provided, errors and status codes documented, limits / constraints documented.

Adopt. Both sit at 75/100 here. Mailgun misses no mandatory sales call, programmatic credential creation, cli available; ZeroBounce misses agent-compatible signup flow, programmatic credential creation, cli available.

Operate. Mailgun leads 53 to 35. Mailgun misses structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable; ZeroBounce misses structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable, agent compatibility verified.

Pricing

Mailgun does not publish a machine-readable starting price and has a free tier. ZeroBounce does not publish one and has a free tier.

Signal by signal

Which to pick

ZeroBounce clears more of the signals an agent needs, so it is the safer default for unattended use. Full profiles: Mailgun and ZeroBounce. Alternatives to each: Mailgun, ZeroBounce.

An agent can fetch this as data: POST /v1/compare {"slugs": ["mailgun", "zerobounce"]}