Use your SMTP infrastructure. Orchestrate it from one dashboard.
Connect any SMTP server — your own, a third-party relay, or a managed service — and route through Mailers.io with quota awareness, suppression, templates, and reporting.
- SMTP endpoint
- AnySMTP endpoint
- Encrypted
- TLSEncrypted
- Per server
- QuotasPer server
- Reporting
- UnifiedReporting
Bring any SMTP server — keep full control.
Plenty of teams already run on SMTP: self-hosted postfix, a corporate mail relay, a managed MTA, or an ESP that exposes SMTP credentials. Mailers.io doesn't force a rebuild — we plug directly into the SMTP endpoints you already trust.
Once attached, your SMTP server behaves like every other sending source on the platform. Quota caps, routing priority, failover, suppression, and reporting apply the same way. You keep the underlying infrastructure. We add the orchestration layer around it.
From SMTP credentials to orchestrated sending in minutes.
- Step 1
Attach the endpoint
Paste host, port, username, password, and TLS settings. We store credentials encrypted and use them only at send time.
- Step 2
Set quotas & priority
Define max per hour, max per day, and priority. We route within the limits and fall through to other servers when one caps out.
- Step 3
Send, monitor, repeat
Route via API, campaigns, or automations. Delivery, bounces, and provider errors surface in unified reporting.
Everything you expect from a production SMTP integration.
TLS, auth, pooling, timeouts, retries, observability — handled at the platform level, not in your app code.
Secure credentials
Encrypted at rest, decrypted only at send time. Rotate or revoke without redeploying.
TLS & auth flexibility
STARTTLS, SMTPS, and common auth schemes. Configure per-server security policy.
Quota-aware routing
Per-hour and per-day caps enforced automatically. Sends queue instead of failing when capped.
Failover pools
Group SMTP servers into pools. On error, we fall through to the next healthy server.
Unified observability
Every send logged with server attribution, response code, and timestamp for audit.
Works alongside APIs
Mix SMTP with ESP APIs (SES, Mailgun, Postmark) in the same pool. Provider-agnostic.
- You already run SMTP infrastructure and want to keep it
- You want multi-provider routing without ripping out what works
- You need quota enforcement your app code cannot reliably do
- You want unified reporting across SMTP and ESP APIs
- SMTP cannot, on its own, provide analytics like opens/clicks — those come from templates + platform
- Authentication records (SPF/DKIM/DMARC) must still be configured on your domain
- Connection limits on the SMTP server still apply; pool sizing should reflect them
Questions answered clearly.
Keep your SMTP. Add the orchestration layer it lacks.
Connect your SMTP server in minutes and route sends through one dashboard with quotas, failover, and clean reporting.