Connect every provider. Send through one platform.
Works with every provider you already use
- Amazon SES
- Mailgun
- SendGrid
- Resend
- Postmark
- Brevo
- SparkPost
- ElasticEmail
- Mailjet
- Blastengine
- Gmail OAuth
- Microsoft 365
- Postfix
- Exim
- Custom SMTP
You keep your provider accounts, your domains, and your sending reputation. Mailers.io is the control layer on top — no lock-in, no reselling, no hidden infrastructure.
From provider chaos to one control plane
Four steps to stop juggling dashboards, API keys, and sending limits. Your stack stays yours — Mailers.io just makes it operable.
Connect your providers
Add SES, Mailgun, SendGrid, Resend, Postmark, Brevo, SMTP, Gmail OAuth — any combination. Use your own API keys and your own domains.
Configure routing
Set per-provider quotas, hourly and daily caps, priority weights, and fallback rules. Mailers.io enforces them automatically on every send.
Send, campaign, automate
Push through the unified API, run campaigns from the dashboard, or trigger automations. Mailers.io picks the right provider in real time.
Monitor & govern
See delivery, bounces, complaints, and quota usage across every provider. Enforce suppression, roles, and audit logs from one console.
A full outbound email control plane
Not a relay. Not a newsletter tool. Mailers.io is the operating layer your team runs on top of every sending provider, for every type of email.
Multi-provider sending
Connect SES, Mailgun, SendGrid, Resend, Postmark, Brevo, SparkPost, ElasticEmail, Blastengine, Gmail OAuth, and any SMTP server. Route the same stream through all of them.
Quota-aware routing
Set per-provider hourly and daily caps. Mailers.io respects every limit, redistributes load across eligible providers, and never pushes past your thresholds.
Unified sending API
One REST API covers sending, provider control, lists, subscribers, and analytics. Swap providers in the background without touching application code.
Campaigns & automations
Run bulk campaigns, drip sequences, event-based, time-based, and condition-based automations — all routed through your connected provider pool.
Suppression & compliance
Global unsubscribe, bounce suppression, complaint handling, list-unsubscribe headers, domain-level do-not-contact, and a full audit log trail.
Teams & custom roles
Invite users, define custom roles, and assign Full Access or Read Only per resource group: campaigns, lists, automations, templates, forms, servers, domains.
Central dashboard
One portal for every customer, campaign, template, list, form, sending server, sending domain, and tracking domain. Full visibility without context switching.
Domains & sending servers
Manage sending domains with SPF/DKIM/DMARC, attach sending servers to specific providers, and isolate reputation per workspace, client, or campaign.
One platform. Four views into it.
Routing, API, campaigns, and automations — all operating on the same provider pool, the same suppression rules, and the same team permissions.
Routing Configuration
Quota-aware, priority-based routing
Amazon SES
200k/day
SendGrid
100k/day
Mailgun
150k/day
Resend
50k/day
Auto-routed 124k emails today. SES approaching quota — failover to SendGrid staged.
Your providers. Orchestrated in real time.
Mailers.io watches every connected provider's quota, health, and priority — and decides where each message goes at send time. You configure the rules. The engine does the rest.
Quota caps
per-hour and per-day limits per provider
Health checks
auto-exclude providers returning errors
Priority & weight
route by cost, reputation, or region
Instant fallback
reroute the moment a provider stalls
Why it matters
Single-provider setups break at the worst moment — a quota hit, an outage, a reputation drop. Orchestration turns those moments into non-events.
Routing engine
- SES
Amazon SES
200k/day · P1
Routing now - MG
Mailgun
150k/day · P2
Ready - SG
SendGrid
100k/day · P3
Near quota - RS
Resend
50k/day · P4
Ready - PM
Postmark
50k/day · P5
Standby
Decision: route via SES (P1 · 78% quota · healthy)
SendGrid paused at 91% to stay under daily cap. Postmark held on standby for overflow after 18:00 UTC.
Configure once in the dashboard. Enforced on every single send.
Read the routing docsIntegrate once. Send through everything.
A single REST API for sending, campaigns, subscribers, templates, providers, and suppression. Add or swap providers without touching your application code.
API key auth
Bearer tokens, scoped per workspace and team role.
Event webhooks
Delivery, bounce, complaint, open, click — real-time.
JSON-first
Predictable request and response shapes. Idempotent.
Same API, every provider
Provider selection happens server-side. Your code stays clean.
{
"from": "hello@yourco.com",
"to": "lead@prospect.com",
"subject": "Quick question",
"template_id": "tpl_outbound_v3",
"provider": "auto",
"tags": ["outbound", "q2"]
}{
"id": "msg_01jk9x...",
"status": "queued",
"provider": "ses",
"sending_server": "ses-prod-eu",
"routed_at": "2026-04-19T14:32:01Z"
}Core endpoints
v1/v1/send/v1/send/bulk/v1/campaigns/v1/subscribers/v1/templates/v1/providers/v1/suppressions/v1/eventsReal governance for serious email teams
Build custom roles and assign Full Access or Read Only across campaigns, lists, automations, templates, forms, sending servers, and sending domains — resource by resource.
Team members
Workspace access for everyone you invite
Aanya Rao
aanya@acme.co
Marco Silva
marco@acme.co
Priya Sharma
priya@acme.co
Tom Eriksen
tom@acme.co
Permission matrix
Granular access per resource group
| Permission | Owner | Admin | Operator | Analyst |
|---|---|---|---|---|
| Campaigns & Automation | ||||
| Create & edit campaigns | ||||
| Run automations | ||||
| View analytics & reports | ||||
| Lists, Forms & Templates | ||||
| Manage mail lists | ||||
| Manage forms | ||||
| Manage templates | ||||
| Sending Infrastructure | ||||
| Add / remove sending servers | ||||
| Manage sending domains | ||||
| Edit routing & quotas | ||||
| Workspace & Governance | ||||
| Invite & manage users | ||||
| Billing & plans | ||||
| API keys & audit logs | ||||
Suppression and governance as first-class citizens
Every send passes through a shared compliance layer: global unsubscribe, bounce and complaint suppression, domain-level blocks, and a full audit trail. It's not an add-on — it's part of the send path.
Global Unsubscribe
Unified opt-out list applies across all providers and campaigns. One unsubscribe, everywhere.
Bounce Suppression
Hard and soft bounces are tracked and suppressed automatically across your entire sender pool.
Complaint Handling
Spam complaints are captured via FBL integrations and immediately removed from future sends.
Domain-Level Suppression
Block entire domains from receiving mail. Useful for do-not-contact agreements and competitor exclusions.
List Unsubscribe Header
RFC-compliant List-Unsubscribe headers added automatically to every message, satisfying ISP requirements.
Audit Logs
Full tamper-evident audit trail of every send, suppression event, and configuration change. Export for compliance.
Built for teams that run outbound seriously
From cold outbound to SaaS lifecycle traffic, Mailers.io is the control layer your team operates on top of every provider.
A serious operating layer for outbound
Cold email teams need structured sending across multiple providers, strict quota control, and clean suppression. Mailers.io gives you the routing engine, the sequence builder, and the governance — without locking you to one provider.
- Spread volume across your connected providers
- Hourly and daily caps enforced per provider
- Sequences, automations, and reusable templates
- Unified suppression across every campaign
Trusted by teams that send at scale
Engineering teams and growth teams alike rely on Mailers to keep email reliable, compliant, and effortless.
"We used to juggle three sending providers with custom glue code. Mailers replaced all of it with one API and a routing engine we actually trust. Engineering stopped being on call for email."
Priya Mehta
Head of Engineering · Elevate HQ
"Suppression, complaint handling, and the audit log were the reason we moved. Having governance baked into the send path — not bolted on — is what sold our compliance team."
James Whitfield
CTO · Spendr
"Our growth team and infra team used to argue about provider quotas. Now they share one workspace, with roles scoped to what they actually own. The Slack fires stopped."
Sofia Andrade
Director of Growth · Workflo
"When one provider starts to degrade, Mailers just redistributes. We didn't write a single line of failover code — we set the rules once and the platform enforces them."
Daniel Osei
Infrastructure Lead · Payrail
"The API is clean. One endpoint, one SDK, and provider switching without touching application code. We kept our existing SES and Mailgun accounts and plugged them in directly."
Yuki Tanaka
Backend Engineer · Lattice Labs
"Running outbound campaigns and transactional sends from the same platform, with proper isolation between sending domains and servers — that's the setup we always wanted and never had time to build."
Camille Leroy
Revenue Operations · Revscale
Pricing for the control layer, not your send volume
You bring your own providers and pay them directly for usage. Mailers.io charges for the orchestration, governance, and tools on top.
Free
All the basics for businesses or individuals getting started with email marketing.
2,500 sending credits every month
Start for Free- 2,500 sending credits / month
- Unified REST API & dashboard
- 1 connected provider
- Campaigns & basic automations
- 7-day analytics retention
- Community support
Essentials
10,000 sending credits / month
Must-have features for agencies and individuals running real email marketing.
What's included
- 10,000 sending credits / month
- 3 connected providers
- 2 team members
- Webhooks & API access
- Suppression & DNC lists
- Email support
Standard
50,000 sending credits / month
Powerful stats and insight reporting for maximized sales and marketing performance.
What's included
- 50,000 sending credits / month
- 5 connected providers
- 5 seats with custom roles
- Quota-aware multi-provider routing
- Advanced automations & sequences
- Priority email support
Premium
150,000 sending credits / month
Advanced features for professionals who need unlimited marketing capability.
What's included
- 150,000 sending credits / month
- Unlimited providers & SMTP servers
- 15 seats with custom roles
- SSO / SAML
- Full audit logs (1-year)
- Priority + chat support
Enterprise — multi-client orchestration at any scale.
One contract. Unlimited client workspaces. White-label surfaces. Per-client sending domains, IP pools, and audit trails. SSO, SCIM, and a named CSM so your ops team never runs support on our behalf.
Everything in Premium, plus
- Full white-label: dashboard, domains & email surfaces
- Unlimited workspaces, clients & team members
- Dedicated sending servers & IP pools per client
- SCIM provisioning & advanced SAML
- Contracted 99.99% uptime SLA
- Named Customer Success Manager
- Security & compliance review (signed DPA, GDPR docs, security questionnaires)
Start on Free forever. Upgrade when your volume grows. Compare all features
Straight answers about what Mailers.io is
We're deliberately not an email provider, a lead database, or an inbox tool. Here's exactly what we are and what we do.
Contact supportNo. Mailers.io is the orchestration and control layer that sits on top of the providers you already use — Amazon SES, Mailgun, SendGrid, Resend, Postmark, Brevo, SMTP servers, and more. You bring your own accounts and your own domains. We handle the routing, governance, and tooling around them.
You set per-provider hourly and daily caps, priorities, and fallback rules. On every send, Mailers.io checks health, current usage, and your rules before choosing the right provider in real time. When one provider nears its quota or starts to degrade, traffic shifts automatically — no code changes, no manual intervention.
Out of the box: Amazon SES, Mailgun, SendGrid, Resend, Postmark, Brevo, SparkPost, ElasticEmail, Mailjet, Blastengine, Gmail OAuth, Microsoft 365, Postfix, Exim, and any custom SMTP server. You can mix and match across workspaces and campaigns.
Not today. Mailers.io is focused on outbound orchestration — sending, routing, campaigns, automations, suppression, and analytics. Reply handling and inbox management are intentionally out of scope so the platform stays sharp at what it does best.
You can build custom roles and assign Full Access or Read Only across every resource group: campaigns, lists, automations, templates, forms, sending servers, and sending domains. Invite clients or teammates and scope them exactly to what they should touch.
Yes — that's a core use case. Each client can live in its own workspace with its own providers, sending domains, and sending servers. You control access at the role and resource level, and every send flows through a shared suppression and audit layer.
A clean REST API covering /v1/send, /v1/send/bulk, /v1/campaigns, /v1/subscribers, /v1/templates, and /v1/events. Authentication is API key-based, scoped per workspace and role. You integrate once and swap or add providers on the server side without touching your code.
Global unsubscribe, bounce suppression, complaint handling, list-unsubscribe headers, domain-level suppression, and a full audit log are part of the send path — not optional add-ons. We also enforce encryption in transit and at rest, role-based access, and scoped API credentials.
Put every provider behind one control plane.
Plug in SES, Mailgun, SendGrid, Resend, SMTP — whatever you already use. Set your routing rules. Send, campaign, and automate through a single API and dashboard your whole team can operate.