Email & messaging

Mailgun

Email sending, validation, receiving, and deliverability APIs.

Agents can send and inspect email delivery flows through API endpoints with clear domain and event concepts.

Agent access evidence

API

native

Mailgun API is documented with OpenAPI and covers messages, domains, events, routes, and keys.

Evidence

Browser

partial

Control panel is useful for domain setup, logs, and deliverability review.

Evidence

Account creation

strong

Self-serve signup with domain verification.

Evidence

Pricing clarity

strong

Pricing is public by monthly volume and features.

Evidence

Docs quality

strong

Docs include API reference, SDKs, webhooks, and deliverability guidance.

Evidence

Readiness score

Usable

Usable: 57/100. Strongest in agent readability; weakest in agent safety.

Machine operability12.5/25

Agent safety4.4/25

Agent readability17.4/20

Auth and setup12/15

Production reliability10.4/15

Best for

Transactional email, inbound routes, email validation, and delivery analytics.

Pricing

Public monthly and usage-based email pricing.

Auth

API keys, domain credentials, webhooks, and signatures.

Account creation

Self-serve signup with domain verification.

Browser support

Control panel is useful for domain setup, logs, and deliverability review.

API

https://api.mailgun.net/v3

Limitations

Key limitations: Sender reputation, compliance, and bulk sends need approval and throttling. Outbound messages, SMS, email deliverability, consent, unsubscribe behavior, private chats, and customer-facing replies need approval, throttling, and audit logs. API automation needs client-side throttling, idempotency where supported, pagination limits, retries, and audit logging. Account setup or elevated access may require vendor, admin, or compliance approval before an agent can operate independently.