Lettermint

What Lettermint is

Lettermint is an email delivery platform from Lettermint B.V., a company incorporated in the Netherlands, and its footer sums up the pitch in two short sentences: "Built in the Netherlands. Hosted in Europe." It covers three kinds of email. Transactional email is the core: order confirmations, password resets and notifications triggered from your application over an API or SMTP. Broadcast email covers newsletters, campaigns and product updates sent to a whole audience, on the same delivery setup. Inbound email receives messages sent to your addresses and hands them to your application through webhooks. The homepage says the service is "Designed by and for developers", and the customers quoted there are mostly founders of small software companies, agencies and online services who wanted an EU-based provider. Plans start with a free tier of 300 emails a month, and paid plans are billed in euros.

Sending transactional email

Sending works through a REST API, an SMTP relay or official SDKs. The homepage lists Node, PHP and Laravel alongside SMTP, REST and MCP, and says the platform has more than 25 integrations. The FAQ on the company's comparison page gives the SDK list as Laravel, Node.js, PHP, Python, Go and Java, plus integrations such as WordPress, Zapier and Make. MCP here is a Model Context Protocol server that lets AI agents connect to a Lettermint account, and a Team API covers the account setup steps, so a move to Lettermint can be scripted end to end or handed to an AI assistant.

Getting started follows the steps the company lists: sign up without a credit card, verify your domain with SPF, DKIM and DMARC, create an API token and send your first email, which the FAQ says usually happens within minutes. DKIM is managed for you. Lettermint hosts the key behind CNAME records and replaces it every six months without interrupting sending. A migration from another provider adds one useful step, importing your suppression list as a CSV so that known bounces and unsubscribes stay blocked from the first day. The site's comparison table puts the attachment limit at 25MB per email.

Several domains fit in one account, which the homepage presents as a way to manage different projects and brands from one login. The number of domains depends on the plan, as the pricing section below shows. Reviews on the homepage mention the WordPress integration, the Laravel package and contact forms on agency client sites, which gives a sense of the typical setups.

Deliverability and infrastructure

Lettermint says it sends from its own infrastructure and its own IP ranges, under its own autonomous system (AS213427), so a customer's sender reputation is not shared with unrelated tenants on a hyperscaler. Transactional and broadcast email run on separate IP pools, so newsletters and one-to-one mail do not share IP addresses. Instead of quoting a deliverability percentage, the company publishes a Time to Inbox page with live measurements of how many seconds an email takes to reach Gmail, Outlook, Yahoo, iCloud and other mailbox providers. The homepage promises that emails reach inboxes rather than spam folders, and one customer review adds that Lettermint checks emails for spam before sending.

Analytics

The homepage describes the analytics as clear and privacy-friendly, with delivery, open and bounce rates tracked so you can identify delivery issues. The dashboard view on the homepage lists each message with its status, such as processed, sent, delivered or bounced. Starter and Growth include essential analytics and Pro includes advanced analytics. Customers quoted on the site mention a clean, modern dashboard more often than any single feature.

Broadcast and inbound email

Broadcast is Lettermint's name for marketing email. The comparison page FAQ says you can send order confirmations, password resets, newsletters and promotional campaigns from the same account, and broadcast mail travels over its own IP pool.

The inbound product turns incoming mail into data for your application. You create an inbound route, and each message that arrives is parsed and sent to your webhook endpoint as a POST request with structured JSON: sender, recipients, subject, body, headers and attachments. The default address sits on inbound.lettermint.co, or you can use your own domain, such as support@yourdomain.com, by adding an MX record that points to Lettermint's inbound server. Built-in spam filtering blocks unwanted mail before it reaches the webhook; you can set the threshold or turn filtering off, and every payload carries spam scoring so your application can decide what to do with a suspicious message. The company suggests support ticket systems, reply tracking for campaigns and turning emails into tasks. Inbound messages count toward the monthly email volume, so the 10,000 emails in Starter can be split between sending and receiving as you need.

Plans and prices

The pricing section shows four plans, with a volume selector running from 10,000 to 1,500,000 emails a month. At the 10,000 level the prices are:

• Free: 300 emails a month, no credit card required, 1 domain, 1 user, SMTP relay, integrations and SDKs. The Free plan stays free, also in production.
• Starter: €10 a month, 10,000 emails a month, extra emails at €1.50 per 1,000, 5 domains, unlimited users, basic customer support and essential analytics. The page calls it great for small projects and indie developers.
• Growth: €13 a month, 10,000 emails a month, extra emails at €1.15 per 1,000, 30 domains, unlimited users, basic support and essential analytics, aimed at growing businesses, startups and agencies.
• Pro: €15 a month, 10,000 emails a month, extra emails at €1.10 per 1,000, unlimited domains and users, priority customer support and advanced analytics.

You can upgrade, downgrade or cancel anytime. Billing is in euros from an EU company, which the FAQ notes avoids currency conversion and produces an invoice that works for European bookkeeping and VAT. The site has separate pages for startups and students, and members of the company's Discord get €10 in credits.

Data protection and compliance

Data location is the other half of the pitch. According to the comparison page, email data is hosted, stored and processed in the EU on infrastructure Lettermint owns and operates, and that is a written commitment in its data processing agreement. The DPA applies automatically to every customer under Article 28 GDPR and is countersigned on request. The subprocessor list is public and says what each one does and where, and changes are announced 30 days ahead. Email data is never used for model training, it is deleted when you close your account, and there are no transfers outside the EEA on Lettermint's initiative. The company states it is GDPR compliant and certified to ISO/IEC 27001:2022, with the certificate, policies and live security controls in a Trust Center at trust.lettermint.co. It describes itself as independent and founder-owned, with no US parent company, and says the US CLOUD Act therefore does not reach customer email data.

Support

Paid plans include basic customer support and Pro adds priority support, next to a knowledge base and a help center. The company also runs a Discord community and says customers can reach it on X and Bluesky. Reviews on the homepage return to support again and again, one mentioning a quick answer on a Sunday evening, another a migration of all systems within an hour. The site itself is available in English, Dutch, German, French and Spanish, and a public changelog and roadmap show what is being built.

Who it suits

Lettermint suits European developers and small software companies that want transactional email from a provider whose company and infrastructure both sit in the EU, and that like a clear euro price. The free plan covers a side project or a low-volume app, and the step to Starter is small. Agencies get unlimited users, up to 30 domains on Growth and unlimited domains on Pro, which fits many client sites under one account. Teams that also want newsletters or inbound processing can keep all three on one bill instead of adding vendors.

The broadcast side is presented as delivery for larger volumes rather than as a full marketing suite, so a marketing team that lives in a campaign builder with complex automation may pair Lettermint with a separate tool. For developers and privacy-minded companies sending application mail, it is a straightforward and well-documented option.