Lettermint
Dutch email API and SMTP relay for transactional and broadcast mail, with inbound processing and a public subprocessor list
Quick Overview
| Company | Lettermint B.V. (Dutch Chamber of Commerce 99337711) |
|---|---|
| Category | Email Deliverability |
| Headquarters | Zwolle, Netherlands |
| EU Presence | EU (Netherlands) |
| Data Location | Netherlands and Germany per the subprocessor list: private cloud at UpCloud (Netherlands), encrypted backups at OVH Cloud (Germany), monitoring at Postmastery (Netherlands); email data encrypted at rest |
| Open Source | No |
| Pricing | Free: 300 emails per month, 1 domain, 1 user, no credit card required. Paid plans are priced by monthly volume: at 10,000 emails per month, Starter €10, Growth €13, Pro €15 (Starter is marked as recommended). Volume steps on the pricing page run from 10,000 to 1,500,000 emails per month. Source: lettermint.co/pricing, checked on 13 November 2026. |
| Free Option | Free plan: 300 emails per month, no credit card required (no time-limited trial stated) |
| Replaces | Postmark, Mailgun, SendGrid |
Detailed Review
Lettermint is a transactional and broadcast email service run by Lettermint B.V. from Zwolle in the Netherlands. The terms of service, privacy policy and DPA all name the same Dutch entity, registered with the Chamber of Commerce under 99337711.
One account sends application mail and newsletter-style campaigns over an SMTP relay or an HTTP API, with webhooks reporting delivery events and inbound processing for replies. It is the same developer-first shape as Sweego and MailPace, with a broadcast side that MailPace does not offer.
The pricing page lists a free plan of 300 emails a month for one domain and one user, with no credit card. Paid plans are priced by monthly volume, and at 10,000 emails a month Starter costs €10, Growth €13 and Pro €15. That makes the entry price comparable to MailPace at $10 for 10,000 and Sweego's Individual plan at €10, while EmailLabs gives 9,000 free emails a month and Scaleway undercuts everyone per email once volume grows.
The subprocessor list is the part to read. It names UpCloud in the Netherlands for private cloud, OVH Cloud in Germany for encrypted backups and Postmastery in the Netherlands for monitoring, so all three providers are European.
What the pages do not show is any certification: EmailLabs lists ISO 27001 and ISO 27018, Lettermint states none, so its security case rests on the DPA and that list. It is also a young vendor, with no founding year or ownership published, which is why it sits last on this page.
What Lettermint does well
- One Dutch entity named across terms, privacy policy and DPA
- Public subprocessor list with each provider and its country
- Free plan with no credit card required
- Transactional, broadcast and inbound email in one account
- Paid plans start at €10 for 10,000 emails a month
Where Lettermint falls short
- Free plan is capped at 300 emails a month, 1 domain and 1 user
- No certification stated, unlike EmailLabs with ISO 27001 and ISO 27018
- Ownership and founding year are not published
- Runs on three third-party providers, so the supplier chain has several links
Standout feature. It publishes a subprocessor list with a country for each provider, all of them European, next to a €10 starting plan.
Pros and Cons
Pros
- One Dutch entity named across terms, privacy policy and DPA
- Public subprocessor list with each provider and its country
- Free plan with no credit card required
- Transactional, broadcast and inbound email in one account
- Paid plans start at €10 for 10,000 emails a month
Cons
- Free plan is capped at 300 emails a month, 1 domain and 1 user
- No certification stated, unlike EmailLabs with ISO 27001 and ISO 27018
- Ownership and founding year are not published
- Runs on three third-party providers, so the supplier chain has several links
Alternatives to Lettermint
Frequently Asked Questions
What is Lettermint?
Lettermint is a transactional and broadcast email service run by Lettermint B.V. from Zwolle in the Netherlands. The terms of service, privacy policy and DPA all name the same Dutch entity, registered with the Chamber of Commerce under 99337711.
One account sends application mail and newsletter-style campaigns over an SMTP relay or an HTTP API, with webhooks reporting delivery events and inbound processing for replies. It is the same developer-first shape as Sweego and MailPace, with a broadcast side that MailPace does not offer.
Where is Lettermint based?
Lettermint operates from Zwolle, Netherlands, which places it under EU (Netherlands).
What does Lettermint cost?
Free: 300 emails per month, 1 domain, 1 user, no credit card required. Paid plans are priced by monthly volume: at 10,000 emails per month, Starter €10, Growth €13, Pro €15 (Starter is marked as recommended). Volume steps on the pricing page run from 10,000 to 1,500,000 emails per month. Source: lettermint.co/pricing, checked on 13 November 2026.. Free plan: 300 emails per month, no credit card required (no time-limited trial stated).
Who is Lettermint best for?
Developers wanting API, SMTP and inbound from one Dutch vendor. It publishes a subprocessor list with a country for each provider, all of them European, next to a €10 starting plan.
What are the drawbacks of Lettermint?
Free plan is capped at 300 emails a month, 1 domain and 1 user. No certification stated, unlike EmailLabs with ISO 27001 and ISO 27018. Ownership and founding year are not published. Runs on three third-party providers, so the supplier chain has several links.
Is Lettermint a good alternative to Postmark?
Lettermint is built as a European alternative to Postmark: Dutch email API and SMTP relay for transactional and broadcast mail, with inbound processing and a public subprocessor list. It will not be a like-for-like feature match in every respect, so check the review above for where the two genuinely differ before switching.
How does Lettermint compare to other Email Deliverability tools?
Lettermint is one of several European Email Deliverability tools we cover. It is most often compared with Postmark, Mailgun, SendGrid.