Lettermint
- Company typePrivate
- Founded2025
- HeadquartersZwolle, Netherlands
- Headcount1–10
- GTM typeB2B
- OfferingSoftware
What Lettermint does
Lettermint B.V. is a Netherlands-based email service provider incorporated in 2025, headquartered in Zwolle, and operating fully founder-owned and bootstrapped with no external investors. The company delivers transactional, broadcast, and inbound email as three integrated product lines, served through a REST API, SMTP relay, and eight-plus official SDKs spanning Node.js, PHP, Laravel, Python, Go, Java, and Nuxt, plus a WordPress plugin, Magento module, and no-code connectors on Zapier, Make, Stripe, Mailcoach, and Listmonk. Underlying architecture relies on entirely European infrastructure (no Amazon, Google, or Microsoft cloud providers) with separated pipelines for transactional and broadcast sends, custom routing headers (X-Lettermint-Route, X-LM-Tag), and a proprietary Time to Inbox monitoring system that measures email delivery latency across Gmail, Outlook, Yahoo, iCloud, and Zoho at 10-minute refresh intervals.
Lettermint firmographics
Firmographics- Name
- Lettermint
- Legal name
- Lettermint B.V.
- Website
- https://lettermint.co
- Company type
- Private
- Founded year
- 2025
- Operating status
- Operating
- Headcount range
- 1–10 employees
- Ownership category
- akta.pro rank
Lettermint industry classification
Industry- Product category
- Transactional Email Delivery Platform
- SIC
- Services-Prepackaged Software (7372), Services-Computer Processing & Data Preparation (7374)
- akta.pro primary industry
- Email, Calendar & Scheduling (BPAMAMAC)
- akta.pro secondary industry
- Email Marketing Services (Campaigns, Deliverability, Lifecycle) (BPAFAKAB)
Keywords
Where Lettermint is headquartered
LocationHeadquarters
- HQ city
- Zwolle
- HQ country
- Netherlands
- HQ region
- Europe
Offices1 record
Markets served
Lettermint business model
Business model- GTM type
- B2B
- Offering type
- Software
- Cost components
- Technology or R&D, Infrastructure, Personnel, Operations, Marketing or Sales
Revenue model
- Subscription Plans: Four-tier subscription model (Free, Starter €10/mo, Growth €13/mo, Pro €15/mo) with increasing email volumes and features. All tiers include base email allowance.
- Overage Emails: Additional emails beyond plan limits priced at €1.10-1.50 per 1,000 emails depending on plan tier. Allows scaling beyond base allocation.
- Dedicated IPs Add-on: €50/month add-on for dedicated IP address available exclusively to Pro customers for greater control over email sending reputation.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Freemium | Monthly | Free Developer Plan - 300 emails/month |
| Subscription | Monthly | Starter - €10/month for 10,000 emails |
| Subscription | Monthly | Growth - €13/month for 10,000 emails |
| Subscription | Monthly | Pro - €15/month for 10,000 emails |
Go-to-market motion2 records
Distribution channels2 records
Marketing channels5 records
Lettermint product offering
Product offeringCore offering
Lettermint is a European email service provider that delivers transactional, broadcast, and inbound emails via REST API, official SDKs (Node.js, PHP, Laravel, Python, Go, Java, Nuxt), and SMTP relay. All email processing runs on EU-based infrastructure to ensure GDPR compliance and eliminate US Cloud Act exposure, targeting developers and businesses needing reliable inbox delivery.
Product overview
Lettermint is a European email service provider (ESP) offering three integrated email services: Transactional Emails for critical automated communications, Broadcast Emails for marketing campaigns, and Inbound Emails for receiving and processing incoming messages. The platform is built entirely on European infrastructure with a developer-first approach, providing REST APIs, multiple SDKs (PHP, Laravel, Node.js, Python, Go, Java, Nuxt), SMTP relay, and no-code integrations (Zapier, Make). Supporting features include multiple domain management, email analytics, Time to Inbox monitoring, webhooks, spam filtering, and email tracking. All services are designed for GDPR compliance with data processing and storage limited to European data centers.
Differentiator
Problem solved
Functional benefit
Products and services
- Transactional Emails Email delivery service for critical communications triggered by user actions such as password resets, order confirmations, account verification, and invoices. Operates on dedicated infrastructure separate from broadcast emails.
- Broadcast Emails Marketing email service for sending newsletters, promotional campaigns, product updates, and announcements to subscriber lists with automatic unsubscribe links and GDPR compliance features.
- Inbound Emails Service for receiving and processing incoming emails via webhooks. Supports attachments, spam filtering with configurable thresholds, and delivers structured JSON data to webhook endpoints for automated workflows.
- SMTP Relay Traditional SMTP-based email sending service supporting multiple ports (25, 465, 587, 2525, 2465, 2587) and encryption options (STARTTLS, Implicit TLS) with Project API token authentication.
- Time to Inbox Monitoring Real-time email delivery speed monitoring system tracking how long emails take from API call to inbox arrival across major providers (Gmail, Outlook, Yahoo, iCloud, AOL, GMX, Zoho), updated every 10 minutes.
Quantifiable outcome
- Gmail: 3.27s average Time to Inbox
- +2 more outcomes
Companies that use Lettermint
Customer profileNamed customers6 records
Segments4 records
Ideal customer profiles4 records
Lettermint technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- Yes
- API docs
- API detail
Core technology
AI maturity
App detail
Integration24 records
Feature5 records
Lettermint partnerships and signals
Strategic signalPartnerships
One partnership is on record.
- DiscordcoreDiscord community partnership offering €10 credit to server members. Primary community engagement channel for Lettermint.
Scale indicators4 records
Recent moves6 records
Expansion highlights7 records
Lettermint competitors and assessment
Company assessmentRegional players
- SMTP2GO: SMTP2GO is an email delivery service with strong APMEA/UK presence offering SMTP relay and an API for transactional and marketing email. It overlaps on core SMTP/API delivery functionality and reliability focus, mainly competing outside of the US market.
Broad incumbents
- Amazon SES: Amazon Simple Email Service is a hyperscaler transactional and bulk email offering tightly integrated with AWS. It is the dominant low-cost incumbent alternative for developers already on AWS, and a key competitor on price and scale (though less on EU-only positioning).
- SendGrid (Twilio): SendGrid, now part of Twilio, is a leading email API platform offering transactional and marketing email at scale to enterprise and SMB. It competes broadly with Lettermint's API and SMTP surface and is one of the largest incumbents in the category.
- SparkPost: SparkPost (now MessageBird Bird Email) is an enterprise email delivery platform with APIs and SMTP focusing on high-volume transactional and commercial sending. It is a scaled incumbent alternative for the same integration-heavy developer workloads.
Direct peers
- MailerSend: MailerSend is a transactional and bulk email service from the MailerLite group, with a similar developer API, SMTP, and template focus. It targets the same indie/SMB transactional market with overlapping feature set including routes, webhooks, and analytics.
- Mailgun (Sinch): Mailgun is a transactional and marketing email API owned by Sinch with REST and SMTP APIs plus SDKs across major languages. It targets the same developer and SMB customers and overlaps on deliverability, batch sending, and inbound parsing.
- Brevo: Brevo (formerly Sendinblue) is a French-headquartered marketing and transactional email platform with EU data residency as a stated differentiator. It is the closest EU-sovereignty-headquartered analogue to Lettermint's positioning and overlaps on transactional, broadcast, and (via conversations) inbound use cases.
- Resend: Resend is a modern developer-first transactional and broadcast email API with React Email and strong SDK ergonomics. It competes head-on with Lettermint for the same PLG, developer-led adoption motion in the SMB/indie segment.
- Postmark (ActiveCampaign): Postmark is a long-standing transactional email specialist known for reliability, inbox placement focus, and developer-friendly APIs. It targets the same developers-and-SMBs segment as Lettermint with overlapping API and SMTP product surface.
Emerging players
- Mailtrap: Mailtrap originated as an email testing sandbox and has expanded into a sending API for transactional and bulk email. It overlaps with Lettermint on developer audience, API/SDK ergonomics, and PLG-style onboarding.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat5 records
Key risks6 records
Key highlights7 records
Customer concentration
Lettermint social profiles
Digital presenceLettermint compliance and trust
Trust signalCompliance2 records
Lettermint financial estimates
Financial estimateRevenue estimate
Valuation estimate
Lettermint leadership team
Management profileNumber of profiles
Profiles1 record
Lettermint funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Lettermint M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Lettermint
What does Lettermint do?
Lettermint is a European email service provider that delivers transactional, broadcast, and inbound emails via REST API, official SDKs (Node.js, PHP, Laravel, Python, Go, Java, Nuxt), and SMTP relay. All email processing runs on EU-based infrastructure to ensure GDPR compliance and eliminate US Cloud Act exposure, targeting developers and businesses needing reliable inbox delivery.
Is Lettermint a public or private company?
Lettermint is a private company. It is classified as founder individual operated bootstrapped and is currently operating.
When was Lettermint founded?
Lettermint was founded in 2025. It employs 1 to 10 people.
Where is Lettermint based?
Lettermint is headquartered in Zwolle, Netherlands, in the Europe region.
How does Lettermint make money?
Three revenue lines are on record. Subscription Plans are the primary driver. The others are overage Emails and dedicated IPs Add-on.
Who are Lettermint's main competitors?
SMTP2GO is listed as a regional player. Broad incumbents are Amazon SES, SendGrid (Twilio) and SparkPost. Direct peers are MailerSend, Mailgun (Sinch), Brevo, Resend and Postmark (ActiveCampaign). Mailtrap is listed as an emerging player.
Does Lettermint have an API?
Yes. Lettermint provides a REST API for sending emails (Sending API), managing accounts and domains (Team API), and retrieving email statistics (Stats API). The API supports sending transactional emails, broadcast emails, and receiving inbound emails via webhooks. Authentication uses API tokens (Project API tokens for sending, Team API tokens for account management). SMTP relay is also available with ports 25, 465, 587, 2525, 2465, and 2587, supporting STARTTLS and Implicit TLS encryption. Batch email sending allows up to 500 emails in a single API request. Developer documentation is at lettermint.co/docs.
What industry is Lettermint in?
Lettermint's product category is Transactional Email Delivery Platform. Its primary akta.pro industry code is BPAMAMAC, Email, Calendar & Scheduling, with a secondary code of BPAFAKAB, Email Marketing Services (Campaigns, Deliverability, Lifecycle). Its SIC code is 7372.