Lettermint vs Postmark (2026): which should you pick?
As of Nov 12, 2026, Lettermint grades higher than Postmark: 2.6 against 2.2 out of 4.0.
Checked Oct 18, 2026 and Nov 12, 2026 · graded Oct 18, 2026 and Nov 12, 2026 by ToolGPA
Lettermint grades higher on value for money. They get the same grade on the free plan, features, ease of use and platforms.
Price, platforms and features side by side. The table says where each price was read and when.
Lettermint
EU-hosted transactional and broadcast email with SMTP and API
Postmark
Transactional email API and SMTP, with broadcasts on a separate stream
Which one is for you
Pick Lettermint if
- Fits if you need your mail data kept in the EU
- Works for small apps that fit in 10,000 emails a month
Look elsewhere if
- Tight if you stay free, since 300 emails a month, 1 domain and 1 user is the cap
- Watch out: prices are in euros and billed in euros
- Watch out: a dedicated IP is a €50 a month add-on, Pro only, from 300,000 emails a month
- Watch out: written SLAs and bring-your-own-IP are for enterprise customers on Pro
- Pricey if you go over your plan, at €1.10 to €1.50 per extra 1,000 emails
Pick Postmark if
- Fits if you want password resets kept on a separate stream from your newsletters
- Works for apps that need to look back at exactly what an email said weeks later
Look elsewhere if
- Pricey if you send 50,000 emails a month, at $55 with no yearly discount
- Skip it if you want a free plan to run a small app on, as it's 100 emails a month with no tier until 10,000
- Tight if you're on Basic, with 4 users, 5 sending domains and no inbound email
- Not for you if you want a dedicated IP below 300,000 emails a month, and each one is $50 a month on Pro or higher
- Watch out: DMARC reports are an add-on from $14 a month per domain
How we grade them
| 2.6GPALettermintGood | 2.2GPAPostmarkFair | |
|---|---|---|
| Value for money | B€10 a month for 10,000 emails, at the cheaper end of a category whose cheaper quarter tops out at $10. | DGraded on 50,000 emails a month: $55 on Basic or $60.50 on Pro, billed monthly only. That's the dearest in this category at that volume, roughly twice the middle. Bootstrapped companies can ask for $75 of credit. |
| Free plan and trial | CA free plan of 300 emails a month, 1 domain and 1 user with no card; a live app will pass that quickly. | CA free developer plan that never expires and needs no card, but it's 100 emails a month with no way to buy more. That's for testing an integration, not running an app. |
| Features | BTransactional, broadcast and inbound mail in one account, SMTP and a REST API with SDKs, managed IP pools, suppression and a sandbox mode. | BAPI and SMTP with SDKs, separate streams for app and bulk email, inbound email turned into JSON, templates, 45 days of message history and DMARC reports as an add-on from $14 a month. It covers the job; inbound needs Pro. |
| Ease of use | CNo store rating on record. You verify a sending domain with DNS records and wire up SMTP credentials or an API key before the first email goes out. | CJudged on how fast a developer sends a first email: official SDKs, a sandbox mode, ready-made templates for resets and receipts, and migration guides. You'll still verify a domain first. No rating on record. |
| Platforms and integrations | BA web dashboard and an API; the listing names Laravel, Symfony Mailer, WordPress, Node.js and PHP. | BWeb, with an API and SMTP, plus Zapier, WordPress, Stripe, Slack, Supabase, Bubble, Netlify and Datadog. No desktop or phone app, so B is the top. |
| Best for | EU-hosted transactional and broadcast email | app email kept apart from marketing sends |
The GPA is the average of the five grades: an A is 4 points, an F is none. The full reasons are on each tool's page: Lettermint and Postmark. How we grade
Price against what you get
Lettermint starts at about $11.17 a month and scores 2.7 out of 4 on features, ease of use and platforms. Postmark starts at $15 a month and scores 2.7.
They score the same, and Lettermint starts $3.83 a month lower. Of the other email sending services on the chart, none scores higher than Lettermint for less, and none scores higher than Postmark for less.
Features, ease of use and platforms, averaged
What paid plans start at, a month (each step along is roughly double) →
- The best score at each price
- Has a free plan
- No free plan
Where they differ
- Lettermint also covers email campaigns.
- Postmark also covers dMARC.
At a glance
| Lettermint | Postmark | |
|---|---|---|
| Pricing | Free plan | Free plan |
| Starts at | €10 per month for 10,000 emails | $15 per month for 10,000 emails |
| Free plan | 300 emails a month, 1 domain and 1 user, no credit card required, usable in production within those limits. | Free developer plan: 100 emails a month with no expiry and no overages, for testing an integration or a small side project. No credit card needed. |
| Free trial | None listed | None listed |
| Web | ||
| Made by | Lettermint® B.V. | ActiveCampaign, LLC |
| Price read from | lettermint.co | postmarkapp.com |
| Checked | Nov 12, 2026 | Oct 18, 2026 |
Worth knowing
Lettermint
- Prices are in euros; the pricing page says billing is in euros.
- The free plan stops at 300 emails a month, 1 domain and 1 user.
- A dedicated IP is a €50 a month add-on, available only to Pro customers, from 300,000 emails a month.
- Written SLAs and bring-your-own-IP are for enterprise customers on Pro.
Postmark
- There is no tier between the free 100 emails a month and the 10,000-email paid plans.
- Billing is monthly only; the FAQ says annual plans are not offered yet.
- Basic has no inbound email processing and caps users at 4 and sending domains at 5.
- Dedicated IPs start at $50 a month per IP, need Pro or higher and 300,000 emails a month or more.
Key features
Lettermint
- Transactional, broadcast and inbound
- One account covers app email, newsletters and campaigns, and receiving mail. The email allowance is shared across all three.
- SMTP relay, REST API and SDKs
- Official SDKs are listed for Node.js, PHP, Python, Go, Java, .NET, Rust and Elixir, plus a CLI, an MCP server and batch sending of up to 500 emails per API call.
- Managed IP pools
- Mail goes out from warmed-up shared IP pools, with transactional email and newsletters on separate pools. Dedicated IPs are a Pro add-on.
- Spend limits and suppression
- A monthly cap pauses sending instead of billing overage, and a suppression list blocks bounced and unsubscribed addresses.
- Sandbox mode
- Test content, delivery handling and webhooks on a project without sending to real recipients.
Postmark
- Email API and SMTP
- Send through a REST API with official SDKs or through SMTP, with batch sending, a sandbox mode and migration guides from other providers.
- Message streams
- Transactional and bulk or broadcast email run on separate sending infrastructure, so marketing sends do not affect password resets and receipts.
- Inbound email processing
- Pro and Platform turn incoming email into a JSON object and post it to a webhook URL your app handles.
- Templates
- Responsive templates for welcome emails, password resets and receipts, with a template editor and import tool.
- Message history and analytics
- 45 days of full message content by default, adjustable from 7 to 365 days, with bounce details, open and link tracking and a stats API.
- DMARC monitoring
- DMARC Digests reports show authentication problems and who is sending with your domain, sold as an add-on from $14 a month per domain.
Plans
Lettermint
Free€0
300 emails a month across transactional, broadcast and inbound, 1 domain, 1 user, SMTP relay and SDKs.
Starter€10
per month for 10,000 emails
5 domains, unlimited users, basic support and essential analytics. Extra emails are €1.50 per 1,000.
Growth€13
per month for 10,000 emails
30 domains, unlimited users and basic support. Extra emails are €1.15 per 1,000.
Pro€15
per month for 10,000 emails
Unlimited domains, priority support and advanced analytics. Extra emails are €1.10 per 1,000.
Postmark
Free$0
100 emails a month, never expires; extra emails cannot be bought on this plan.
Basic$15
per month for 10,000 emails
5 sending domains, 4 users, 45 days of history, no inbound email. Extra emails $1.80 per 1,000; $55 a month at 50,000 emails.
Pro$16.50
per month for 10,000 emails
10 domains, 6 users, inbound email, retention up to 365 days. Extra emails $1.30 per 1,000; $60.50 a month at 50,000 emails.
Platform$18
per month for 10,000 emails
Unlimited domains, servers, streams and users, with inbound email. Extra emails $1.20 per 1,000; $66 a month at 50,000 emails.
High volumeCustom
Custom pricing for large senders, arranged through sales.
Ways to pay less
Lettermint
- Startups
One-time €60 credit for startups and students
The pricing page says startups and students can claim a one-time credit of 60 euros, which equals 6 months of Starter, added to their account.
Postmark
- Startups
$75 credit for bootstrapped companies
Companies that have launched, are charging for their product and have taken no outside investment can ask support for $75 of account credit.
Common questions
Which is cheaper, Lettermint or Postmark?
As of Nov 12, 2026, Lettermint is cheaper to start with: about $11.17 a month, against $15 a month for Postmark. Lettermint starts at €10 per month for 10,000 emails, and Postmark starts at $15 per month for 10,000 emails.
Which has a free plan, Lettermint or Postmark?
As of Nov 12, 2026, both Lettermint and Postmark have a free plan.
More comparisons
How this page was made
- The verdict at the top follows a fixed rule. When both tools are in the same category and either is in our top three for it, the verdict follows that ranking: the higher-placed tool is our pick. The top three weigh who each tool suits as well as its grades, so a pick can go against the GPA. Otherwise the page does not pick one and says which grades higher: the higher GPA first; on a tie, the one with a free plan, then the one that starts cheaper in dollars a month, counted the same way for both; if they are still level, what the choice depends on.
- The grades are our own, from each tool’s review or report card. The GPA is their average.
- Prices, plans and platforms come from each tool’s listing. The table above says where each price was read and when.
- The differences and the answers to the questions are worked out from those listings.