Reputation isolation built-in

Email that actually
lands

Transactional and marketing emails that hit the inbox.

We handle deliverability so you can focus on your product.

99.2% inbox placementStarts at $2/moSetup in 2 minutes
Domain Warmup
Auto-ramp sending limits
Email Validation
Block invalid before sending
Reputation Isolation
Your domain, protected

Deliverability

We obsess over inbox placement

Most platforms leave deliverability to you. We built it into the core. Automatic and included on every plan.

99.2%
Inbox placement
<0.1%
Spam rate
<200ms
API latency
100%
Your reputation

Domain Warmup

New domain? We auto-ramp your sending volume over weeks, building trust with inbox providers.

  • Auto-increasing daily limits
  • Health score monitoring
  • ISP-specific pacing

Email Validation

Block invalid, disposable, and risky addresses before they hurt your reputation.

  • Syntax & MX validation
  • Disposable email detection
  • Risk scoring

Reputation Isolation

Your sending reputation is yours alone. Isolated infrastructure means other senders can't drag you down.

  • Isolated sending pools
  • Per-domain reputation
  • No shared IP risk

Included on every plan. No add-ons. No surprises.

One Platform

Every email. One API.

Stop duct-taping SendGrid for transactional, Mailchimp for campaigns, and custom code for inbound. One platform handles it all.

Transactional

Password resets, receipts, notifications. Sub-200ms API. Bounces handled automatically.

Learn more

Marketing

Campaigns, newsletters, product updates. Segment users. Schedule sends. Track opens and clicks.

Learn more

Inbound

Receive replies and support emails. Parse content. Route to webhooks or store in your inbox.

Learn more
curl -X POST https://api.xmit.sh/email/send \
  -H "Authorization: Bearer xmit_live_xxx" \
  -H "Content-Type: application/json" \
  -d '{
    "from": "hello@yourapp.com",
    "to": "user@example.com",
    "subject": "Welcome to YourApp",
    "html": "<h1>Welcome!</h1><p>Thanks for signing up.</p>"
  }'

Why developers switch

From Postmark

Same developer experience. Same inbox rates. 1/10th the price. No luxury tax for good deliverability.

Start with Transmit →

From SendGrid

No shared IPs. No blacklist risk from other senders. Your reputation stays yours with isolated sending pools.

Start with Transmit →

From Amazon SES

Keep SES power, lose the pain. Templates, logs, analytics, and warmup built in. Or bring your own AWS account.

Start with Transmit →
AI-Powered

Design emails by describing them

Stop fighting with drag-and-drop editors. Describe your email in plain text, iterate in seconds, and export production-ready HTML.

Multi-model AI

GPT-4o, Claude, or Gemini. Pick your model.

Brand kits

Define colors, tone, and logo once. Apply everywhere.

BYOK for AI

Use your own API keys. Control your costs.

Try Composer
Composer

"Create a welcome email for new users. Friendly tone, include a CTA to complete their profile. Use our brand colors."

v3 • 2.3s generation
GPT-4oReady

For SaaS Teams

Your users are already contacts

Stop exporting CSVs from your auth provider. Connect once, and every new signup automatically becomes an email contact.

1

Connect your auth provider

Paste your API key. We encrypt it with AES-256-GCM.

2

Users sync automatically

Every 6 hours, new signups become contacts. No code changes.

3

Start sending

Transactional, campaigns, automations. All your users, ready to go.

View integration docs

Clerk

Available

Auth0

Available

Supabase

Coming soon

Firebase

Coming soon

Cognito

Coming soon

Okta

Coming soon
Auto-sync every 6 hours
New users become contacts automatically

Infrastructure

Start simple. Scale infinitely.

Begin with managed infrastructure. Bring your own cloud when you're ready. Same API, same features.

RECOMMENDED

Managed by Transmit

We handle the infrastructure. No cloud account required. Start sending in 2 minutes.

  • No cloud account needed
  • Volume-based pricing
  • Deliverability handled for you
  • Isolated reputation per account
  • Domain warmup included
$2/mo to start
Get Started

Bring Your Own Cloud

Connect your AWS account. Full control. Your reputation. Your infrastructure.

  • Your cloud, your reputation
  • Pay AWS directly (~$0.10/1K)
  • Unlimited sending volume
  • IAM role or access keys
  • All Transmit features included
$0-$149/mo + AWS costs
Learn More

Start managed, switch to BYOK anytime. Same API. Same dashboard. Zero downtime.

Ready to hit the inbox?

Plans start at $2/mo. Setup takes 2 minutes.

Read Docs

99.2% inbox placement. Cancel anytime.