Email Infrastructure for SaaS
The only email API aimed at multi-tenant SaaS platforms. Isolate tenant reputation automatically.
The Challenges
Why SaaS email is hard
Shared Reputation Risk
One bad sender on a shared IP can tank deliverability for your entire SaaS user base.
Predictable Cost Scaling
Contact-based pricing punishes you for growth. Pay only for what you send, with no hidden 'success tax'.
Fragmented Platforms
Using different tools for transactional notifications and marketing campaigns creates data silos and engineering overhead.
The Solution
How Transmit helps SaaS Platforms
Multi-Tenant Reputation Isolation
Every customer gets their own isolated sending reputation. If one user sends spam, it never affects the deliverability of others.
Unified Transactional & Marketing
Send password resets and bi-weekly newsletters through the same infrastructure with one single integration.
Sane Scale Pricing
Volume-based pricing starting at $2/mo. No 'success tax' for growing your subscriber base.
Developer Experience
Simpler SaaS Integration
Our API is built for the modern edge. No heavyweight SDKs, just simple REST and standard protocols.
Explorer documentation// No manual tagging or sub-accounts required.
// Isolation is handled automatically at the platform level.
await fetch("https://api.xmit.sh/email/send", {
method: "POST",
headers: { "Authorization": "Bearer " + API_KEY },
body: JSON.stringify({
from: "Customer <notifications@customer-a.com>",
to: "user@example.com",
subject: "New comment on your post",
html: "<h1>You have a new comment</h1>..."
})
});Other use cases
Frequently Asked Questions
How does reputation isolation work?
How does the BYOK mode work for SaaS?
Ready to scale your SaaS email?
Start managed, upgrade to BYOK. Volume-based pricing starts at $2/month.