Deliverability

Emails that don't sound like a robot wrote them

Templates are efficient but they read like templates. The humanizer rewrites prose before every send, keeping your HTML structure, links, and compliance text intact. You pick the tone.

Side-by-side comparison of a templated email transformed into natural-sounding prose by the humanizer

What happens under the hood

1

Template renders as usual

Variables filled, layout applied. Nothing changes about your existing template pipeline.

2

LLM rewrites the prose

The rendered content passes through an LLM that rewrites copy to sound like a person wrote it. HTML structure, links, compliance text, and unsubscribe links are left alone.

3

Tone is applied

Casual makes it conversational and warm. Professional keeps it clear and direct. Friendly lands somewhere in between, personable and upbeat.

4

Both versions stored

The humanized version gets sent, but we keep the original too. You can always compare what went out versus what the template produced.

Enable per-send

POST /v1/agent/request-send with humanize: true

POST /v1/agent/request-send
{
  "tenantId": "your-tenant-id",
  "recipientEmail": "alice@example.com",
  "templateId": "onboarding-welcome",
  "dedupeKey": "onboarding-alice-step1",
  "payload": { "firstName": "Alice" },
  "humanize": true,
  "humanizeStyle": "friendly"
}

Tone styles

Casual

Contractions, shorter sentences, warm feel. The kind of email you'd get from a coworker, not a department.

Professional

Clear and direct. No fluff, no filler. This is the default, and it works for most B2B and enterprise use cases.

Friendly

Personable and upbeat without being over the top. Good fit for onboarding sequences and customer success touchpoints.

Before and after

Template output

Hi {{firstName}},

Welcome to Molted Email. Your account has been created
and your trial is active for 14 days.

Please complete the following steps to get started:
1. Verify your domain
2. Create your first template
3. Send a test email

Best regards,
The Molted Email Team

After humanizer (friendly)

Hey Alice,

Welcome aboard! Your account is all set and you've got
14 days to explore everything.

Here's how to get rolling:
1. Verify your domain
2. Create your first template
3. Fire off a test email

Excited to have you here - let us know if you need anything!

The Molted Email Team

Configure at the tenant level

You can enable the humanizer globally or override it per-mailbox and per-send. Resolution order: per-send wins, then agent-level, then tenant-level, then off.

// Get current config
GET /v1/me/humanizer

// Enable tenant-wide
PUT /v1/me/humanizer
{
  "enabled": true,
  "style": "professional",
  "provider": "anthropic"
}

One flag. Natural-sounding emails.

Set humanize: true and your templates stop reading like templates. Links, compliance text, and unsubscribe blocks are never touched.

Get started free