Multiple ESP Mailer
A high-throughput sending engine that dispatches your campaigns across multiple email service providers at once — with per-provider rate limits, retries, and suppression built in.
One queue, every ESP.
Overview
The Multiple ESP Mailer is the sending core of our stack. Instead of tying your program to one provider, it spreads volume across every ESP you connect — balancing load, respecting each provider's limits, and recording every attempt so nothing slips through the cracks.
- Send at scale without babysitting individual providers
- Protect deliverability with automatic rate control
- Never lose a send — every attempt is recorded
What it does.
Multi-ESP rotation
Send through AWS SES, Brevo, Mailtrap, self-hosted Mailcow and more from one pipeline.
Per-provider rate limiting
Set global or per-ESP send rates so you stay within each provider's limits automatically.
Queue & retry engine
A fast, Redis-backed queue with automatic retries on transient failures and duplicate suppression.
Full send tracking
Every attempt is logged — queued, sending, sent, failed, or suppressed — for complete auditability.
Horizontal scaling
Shard sending across multiple servers, each claiming its own slice of the queue.
Suppression & compliance
Suppression lists and unsubscribe handling enforced before any message leaves the queue.
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