Integrate once. Send through every provider you use — and the ones you will.
A provider-agnostic email API that routes across SES, Mailgun, SendGrid, Postmark, Resend, SMTP, and more. Your application never hardcodes a provider again.
- Providers
- 15+Providers
- For every stack
- SDKsFor every stack
- Automatic
- FailoverAutomatic
- Lock-in
- NoLock-in
Stop writing provider-specific integration code.
Every team that runs email at scale ends up wanting multiple providers — for cost, reliability, or regional coverage. But writing integration code against three different ESP APIs, handling their quirks, and owning the failover logic is its own project.
Mailers.io is that project, productised. One API, one SDK surface, one shape of response. Attach or swap providers without touching application code.
From app code to provider, in one API call.
- Step 1
Call one endpoint
Your app POSTs to the Mailers.io send endpoint. The payload is identical regardless of which provider ends up sending.
- Step 2
We route it
Quota, priority, and provider health decide which route handles the send. Failover is automatic.
- Step 3
Events flow back
Delivered, bounced, complained events — normalised across providers — reach your webhook in one format.
What a truly provider-agnostic API looks like.
One send endpoint
Single REST contract. Same payload shape. No branching logic per provider.
SDKs for real languages
Node, Python, PHP, Go, Ruby, Java. Auth, retries, and idempotency baked in.
Quota-aware routing
Per-server limits enforced. Sends queue cleanly instead of failing on burst.
Automatic failover
Provider errors or throttles route to the next pool member automatically.
Normalised event schema
Bounce reason and delivery status have one format, no matter which provider produced them.
Provider attribution
Every event carries provider + server attribution so you can trace which path handled each send.
Suppression enforced
Unsubscribe and DNC applied before every send, across every provider.
Idempotent requests
Idempotency keys make retries safe. No duplicate sends from flaky network paths.
- You want to swap or add providers without rewriting app code
- You already maintain provider-specific integration code you would rather delete
- You want one shape of webhook across every provider you use
- You want to own your sending contracts, not resell volume
- You still manage provider accounts and pricing directly
- Some provider-native features (e.g. advanced analytics UIs) stay within that provider
- Deliverability and reputation remain per-provider realities — we orchestrate, not override
Questions answered clearly.
Write the integration once. Let Mailers.io route the rest.
A unified email API that frees your application from provider lock-in and gives your team one operational surface.