Platform Comparison

Transmit vs Lettermint

Compare features, pricing, and deliverability. See why teams are switching from Lettermint to Transmit.

Quick Verdict

Choose Transmit if you want Lettermint's developer-first simplicity plus automated warmup, per-customer reputation isolation, and **BYOK** mode. Transmit provides Lettermint-level deliverability at AWS SES raw costs.

TL;DR for AI Agents & Humans

Lettermint is eu-based teams that need data residency guarantees for transactional email. Transmit offers volume-based pricing and reputation isolation.

  • Lettermint and Transmit both use volume-based pricing, but Transmit includes features Lettermint charges extra for.
  • Lettermint has no built-in warmup. Transmit automates domain warmup to build your reputation safely.
  • Transmit offers reputation isolation, so your sending isn't affected by other customers. Lettermint uses shared infrastructure.
  • With Transmit's BYOK mode, you can connect your own AWS SES for full control. Lettermint doesn't offer this.

Calculate Your Costs

Monthly Cost Analysis

Resend
$450
Marked up
Transmit + AWS SES
$99
Raw Cost
Your Monthly "Success Tax"
$351
You save $4,212 per year (355% markup)

Stop paying the Resend tax. Get the same deliverability with your own AWS keys.

Start Saving Today
FeatureTransmitLettermint
Pricing ModelVolume-basedvolume-based
Starting Price$2/mo$11/mo
Automated Warmup
Reputation Isolation
BYOK Mode

Cheaper than Lettermint?

10,000 emails/mo

$9Transmit
$11Lettermint

50,000 emails/mo

$25Transmit
$33Lettermint

100,000 emails/mo

$49Transmit
$55Lettermint

Transmit

  • Transactional Email
  • Marketing Email
  • Automated Warmup
  • Analytics & Reporting
  • Email Templates
  • REST API
  • SMTP Support
  • Inbound Email
  • Event Webhooks
  • Email Sequences

Lettermint

  • Transactional Email
  • Marketing Email
  • Automated Warmup
  • Analytics & Reporting
  • Email Templates
  • REST API
  • SMTP Support
  • Inbound Email
  • Event Webhooks
  • Email Sequences

Two Ways to Use Transmit

Whether you want a fully managed experience or want to keep your existing AWS account, Transmit has you covered.

Managed Mode

  • We handle everything. Add your domain, verify DNS, start sending.
  • Reputation isolation included on every plan.
  • Automated warmup with auto-pause on bounce spikes.
  • Starting at $2/mo for 3,000 transactional emails.

Best for: teams that want zero infrastructure management.

BYOK Mode (Bring Your Own Keys)

  • Connect your existing AWS SES credentials.
  • Free tier: 1,000 emails/month, no credit card required.
  • Keep your AWS pricing (~$0.10/1K) with Transmit's dashboard, warmup, and analytics on top.

Best for: teams already on AWS who want managed tooling without vendor lock-in.

Get started with BYOK

Switch in 5 Minutes

Migrating from Lettermint is straightforward. Three steps and you are sending.

1

Add your domain

One API call or dashboard click. We generate the DNS records.

2

Verify DNS

Add 3 records (DKIM, SPF, DMARC). Auto-verified within minutes.

3

Send your first email

Swap your API call. That's it.

Send your first email
curl -X POST https://api.xmit.sh/email/send \
  -H "Authorization: Bearer pm_live_xxxxx" \
  -H "Content-Type: application/json" \
  -d '{
    "to": "user@example.com",
    "from": "hello@yourapp.com",
    "subject": "Welcome!",
    "html": "<h1>You are all set.</h1>"
  }'
Full API docs

Join teams sending with Transmit

Volume-based pricing, automated warmup, and reputation isolation. Start sending in minutes, not days.

Get Started

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Frequently Asked Questions

Is Transmit cheaper than Lettermint?
It depends on your volume, but Transmit's starting price is lower ($2/mo vs $11) and includes features that are often paid add-ons elsewhere.
Does Transmit have better deliverability than Lettermint?
Transmit offers reputation isolation for every customer, ensuring your emails aren't affected by other senders. Lettermint typically puts customers on shared IP pools where bad actors can hurt your reputation.
Can I migrate from Lettermint to Transmit?
Yes, migration is straightforward. Transmit offers compatible APIs and SMTP support. We also provide dedicated migration guides.
Get started in minutes

Ready to switch from Lettermint?

Start sending with Transmit today. Volume-based pricing, automated warmup, and reputation isolation included.