toolgrep / Email & messaging / Auth Posture
Alternatives to Auth Posture
Auth Posture: One-call email domain audit API. 8 products similar to Auth Posture, compared on pricing, free tier, API, MCP server, SDK and open source. 8 of 8 have a free tier, 8 of 8 have an API, 4 of 8 offer an MCP server.
- UserCheck
Email and domain intelligence API for detecting disposable and fake emails
- isitdisposable.com
Disposable email address detection via a drop-in JavaScript snippet and a REST API.
- Disban
Email-domain classification API that detects disposable, free, alias, testing and parked domains at signup.
- Mail-Tester
Test your emails for spam score and configuration problems
- Mailsac
Disposable test email addresses for QA and developers
- EmailGuard API
Developer API for email validation: checks live MX records, blocks disposable emails, and autocorrects typos.
- DemiSignal MCP server
MCP server for checking a domain's SPF, DKIM and DMARC records and generating SPF and DMARC records from an AI assistant.
- Suped
All-in-one DMARC platform
Side by side
| Product | Pricing | Free tier | API | MCP server | SDK | Open source |
|---|---|---|---|---|---|---|
| Auth Posture | Freemium · from $5/month | yes | yes | yes | — | — |
| UserCheck | Freemium · from $0/month | yes | yes | no | yes | no |
| isitdisposable.com | Freemium · from $0/month (Free plan, 250 lookups); paid plans from $19/month | yes | yes | no | no | no |
| Disban | Freemium | yes | yes | yes | yes | — |
| Mail-Tester | Freemium | yes | yes | no | no | no |
| Mailsac | Freemium · from 0 | yes | yes | yes | yes | no |
| EmailGuard API | Freemium | yes | yes | no | — | — |
| DemiSignal MCP server | Freemium | yes | yes | yes | no | no |
| Suped | Freemium | yes | yes | yes | — | no |
Facts come from each product's own website, or from its verified owner when they have edited the listing. Each product page shows when it was last verified and how it was extracted. Similarity comes from the products' descriptions.
API
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