MailerSend
MailerSend delivers transactional email through an email API and SMTP relay.
What MailerSend is
MailerSend delivers transactional email through an email API and SMTP relay. Its tools include drag-and-drop, HTML, and rich-text editors, dynamic templates, and split testing. Webhooks, tracking, real-time activity, analytics, and suppression-list management help teams monitor email activity. Inbound routing can parse replies into application events and route them to an app for further action. The Free plan is free and allows 500 emails per month, 100 daily API requests, one domain, and one template. A 14-day Professional trial is available, with 500 emails per month, 100 daily API requests, and one day of log retention. Listed integrations include Zapier, Supabase, Firebase, Slack, Laravel, WooCommerce, WordPress, ChatGPT, and Claude. MailerSend has web, API, and iOS platforms; its mobile app is currently only available for iOS. It states that it is GDPR-compliant and hosts services in a certified ISO 27001 data center in Belgium.
Good
- Supports email API and SMTP relay
- Inbound routing can parse replies into application events
- Includes webhooks and real-time activity monitoring
- Free plan includes 500 monthly emails
- Integrations include Zapier, Firebase, and WordPress
Watch out
- Free plan is limited to 500 emails per month
- Free plan includes only one template and one domain
- Mobile app is currently only available for iOS
- Trial includes one day of log retention
Who it suits
MailerSend suits teams that need transactional email delivery through an API or SMTP relay. Its inbound routing and monitoring tools may also fit applications that process replies or track delivery activity.
Verdict
MailerSend combines transactional delivery with tools for monitoring and processing email activity. Review the plan limits and the iOS-only mobile app availability if either matters to your workflow.
Plans and prices
From MailerSend's own pricing page, checked 15 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Free | Free | 500 emails/month · 100 API requests/day · 1 sending domain · 1 webhook · 1 template · 1 user seat + accountant role · 24-hour activity retention |
| Hobby | $7 a month | 5,000 emails/month · 1,000 API requests/day · 1 domain · 5 webhooks · 10 templates · 5 seats · 1 inbound route · 1,000 API requests/day · $7.00/month; $6.30/month with annual billing |
| Starter | $35 a month | 50,000 emails/month · 100 SMS/month · 100,000 API requests/day · 10 domains · 50 webhooks · 250 templates · 5 seats · 50 inbound routes · 50 sender identities · $35/month; $31.50/month with annual billing |
| Professional | $110 a month | 50,000 emails/month · 150 SMS/month · 500,000 API requests/day · 1,000 domains · 5,000 webhooks · 5,000 templates · 1,000 users · 100,000 inbound routes · 30-day activity retention · 7-day API-log retention · $110/month; $99/month with annual billing |
| Enterprise | Priced on request | Custom plan for large enterprises and special requirements |
The facts
Each one read from MailerSend's own pages, with the date it was checked.
What it does
- API design
- The API is RESTful, uses the https://api.mailersend.com/v1/ base URL and authenticates with bearer API tokens.checked 15 Oct 2026
- API documentation
- Developer documentation covers authentication, endpoints, HTTP status codes, validation errors and plan-specific restrictions.checked 15 Oct 2026
- API limits
- The API rejects attachments larger than 25 MB and restricts bulk-email endpoints to Hobby plans and above.checked 15 Oct 2026
- Audience
- MailerSend describes its Professional plan as intended for agencies and white-label resellers sending at scale, and Starter as for growing startups and small businesses.checked 30 Sep 2026
- Compliance
- The company states that EU data centers hold ISO 27001 and ISO 20000 certifications and that MailerSend follows EU-U.S. and Swiss-U.S. Data Privacy Frameworks.checked 15 Oct 2026
- Email delivery
- It provides both a REST email API and an SMTP relay for transactional sending.checked 15 Oct 2026
- Email tools
- The product includes drag-and-drop, HTML, and rich-text email editors, dynamic templates, and split testing.checked 30 Sep 2026
- Email verification
- Recipient addresses can be verified through the API or application, individually or in bulk.checked 15 Oct 2026
- Inbound email
- Inbound routing parses replies to application events and routes them to an app for further action.checked 30 Sep 2026
- Inbound routing
- Inbound routing receives, parses and forwards incoming email to an application or another address.checked 15 Oct 2026
- Integrations
- Official integrations include WordPress, WooCommerce, Firebase, Symfony, React Email, Supabase, Make, NocoDB, Pipedream, Zapier-related tools and others.checked 15 Oct 2026
- Legal entity
- The data-processing agreement identifies MailerSend, Inc. at 228 Park Ave S PMB 54955, New York, New York 10003-1502, United States.checked 15 Oct 2026
- Limit: account controls
- Reviewers report unexpected account suspensions, strict sending limits and pauses that disrupted production workflows.checked 15 Oct 2026
- Limit: pricing changes
- A Capterra reviewer criticizes the move from a former free Hobby arrangement to a $7 monthly charge and calls the current free plan inadequate.checked 15 Oct 2026
- Limit: retention
- A Capterra reviewer says seven-day activity retention on Starter is too short for investigating older delivery problems.checked 15 Oct 2026
- MCP and CLI
- MailerSend provides a hosted MCP server and a command-line interface for sending email and managing accounts.checked 15 Oct 2026
- Monitoring
- MailerSend offers webhooks, email tracking, real-time activity, analytics, and suppression list management.checked 30 Sep 2026
The company
- Company
- MailerSend says it was launched by the team behind MailerLite and is a United States-registered company.checked 30 Sep 2026
- Company profile
- LinkedIn lists MailerSend as privately held, headquartered in New York, New York, with a company size of 2–10 employees.checked 15 Oct 2026
- Maker relationship
- MailerSend says it was launched by the team behind MailerLite after more than ten years of email-delivery experience.checked 15 Oct 2026
Money
- Free plan limits
- The Free plan allows 500 emails per month and has limits including one template, one domain, one user, and 100 daily API requests.checked 30 Sep 2026
Where it runs
- Limit: verification and approval
- Some Capterra reviewers complain about difficult domain setup or account rejection without a clear explanation.checked 15 Oct 2026
- Mobile app
- MailerSend has an iOS app for managing transactional email activity, performance, and domains; its help page says the app is currently only available for iOS.checked 30 Sep 2026
- Mobile app limitation
- An Apple App Store reviewer reports that the activity tab and message previews failed to show useful data for months.checked 15 Oct 2026
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