MailLinkOne API for Gmail, Outlook, and IMAP/SMTP
One API for every inbox
Prebuilt OAuth flows, unified JSON and webhooks, get from zero to inbox in one afternoon.
Free for development · Unlimited dev environments
Ship email features with a single API
- Unified API for Gmail, Outlook, and any IMAP/SMTP provider
- Zero provider configuration in development
- Unlimited development environments for users and teams
- Per-environment API keys and isolation
- Easy handoff: configure providers when promoting to production
Feature highlights
Built around environments with provider gating and webhooks for production.
Unified inbox API
Send and work with mail via a single set of endpoints.
Gmail, Outlook, IMAP/SMTP
Enable providers per environment; IMAP/SMTP without OAuth.
Webhooks for production
Gmail and Outlook webhooks in production; disabled in development.
Per-environment keys
Publishable/secret keys, provider credentials, and isolation.
How it works
- 1
Sign up
No credit card required for development.
- 2
Create a development environment
Get your publishable and secret keys.
- 3
Build and test
Use the unified API in dev; webhooks are disabled in development.
- 4
Promote to production
Enable providers, add credentials, configure webhooks, go live.
Pricing and policy
Free for development. Pay for production. No credit card required for development. No time limits.
Development
- Free for development
- Unlimited dev environments per user/team
- Zero provider configuration in development
- Webhooks are disabled in the development environment
Production
- Requires an active subscription
- Enable providers, add credentials, configure webhooks
- Pricing is per active inbox connection, with transparent overages for API calls and attachment bandwidth
Development includes environments used for building, testing, or previews. Production is any environment serving real users or live traffic. Provider configuration is only required when promoting an environment to production.
Fair, inbox-based pricing
Only pay for active inbox connections. Development is always free. No enterprise markups — just simple, transparent pricing.
Basic
For indie hackers & small apps.
- 50 inboxes included
- 500k API calls included
- 2 GB egress included
- $0.25 per extra inbox
- $0.40 per 100k extra API calls
Growth
Perfect for growing SaaS products.
- 1,000 inboxes included
- 5M API calls included
- 25 GB egress included
- $0.22 per extra inbox
- $0.35 per 100k extra API calls
Scale
For apps with thousands of users.
- 5,000 inboxes included
- 20M API calls included
- 100 GB egress included
- $0.20 per extra inbox
- $0.30 per 100k extra API calls
Enterprise
For organizations with more than 20,000 inboxes or advanced compliance needs (SLA, SSO, HIPAA/BAA, EU region hosting).
- Unlimited inboxes with volume discounts
- SOC 2, HIPAA, and GDPR compliance support
- Dedicated onboarding & technical account manager
- Custom contracts & SLAs
Pricing is per active inbox connection, with transparent overages for API calls and attachment bandwidth. Dev/sandbox mode is always free. All plans include unlimited projects, Gmail, Outlook, and any IMAP/SMTP provider.
Built for engineering teams
Reliable by design. Tokens and credentials are encrypted at rest. Environments isolate access and configuration.
FAQs
Direct answers for developers and engineering leaders.
Is development really free?
Are there any caps or fair-use limits?
Do I need provider accounts or API keys for development?
How many development environments can I create?
How do I move to production and when do I configure providers?
Can my whole team use development environments for free?
What about security and isolation?
What performance should I expect?
Are webhooks available in development?
Do you support IMAP/SMTP without OAuth?
Start now - free for development
Unlimited dev environments. Providers configured only at production.
Free for development · Unlimited dev environments