MailerSend

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Pricing model

Hybrid (base + usage) [2]checkthat.ai/brands/mailersend/pricingmailersend.com/help/plans-features-and-limits“Free plan allows you to send up to 500 emails a month for free, with a daily limit of 100 emails. Starter plans start from as little as $35 a month, or $31.50”mailersend.com/pricing“Our Free plan has a few limits per account: 1 template, 1 domain, 1 user (plus 1 accountant), 1 API token, 1 webhook, and 100 daily requests.”

Published pricing

✓ Yes [3]mailersend.com/pricing“Our Free plan has a few limits per account: 1 template, 1 domain, 1 user (plus 1 accountant), 1 API token, 1 webhook, and 100 daily requests.”checkthat.ai/brands/mailersend/pricing

Free tier

✓ Yes [4]mailersend.com/help/plans-features-and-limits“Free plan allows you to send up to 500 emails a month for free, with a daily limit of 100 emails.”mailersend.com/pricing“Our Free plan has a few limits per account: 1 template, 1 domain, 1 user (plus 1 accountant), 1 API token, 1 webhook, and 100 daily requests.”

Free tier details

The Free plan allows you to send up to 500 emails a month for free, with a daily limit of 100 emails. Free plan includes: 1 sending domain, 1 API token, 100 daily API requests, 1 webhook, 1 inbound route, 1 SMTP user, 1 template, 1 user seat + 1 accountant, 10 email verification credits, 24-hour activity retention. Free plan does not allow for extra usage/overage. [5]mailersend.com/help/plans-features-and-limits“Free plan allows you to send up to 500 emails a month for free, with a daily limit of 100 emails.”mailersend.com/pricing“Our Free plan has a few limits per account: 1 template, 1 domain, 1 user (plus 1 accountant), 1 API token, 1 webhook, and 100 daily requests.”

Self-serve signup

✓ Yes [6]mailersend.com/help/how-to-start-sending-emails“Send emails using the API · Navigate to the Domains page and click Manage next to the desired domain. · Create an API token. · When your API token is ready, and”mailersend.com/pricing“Our Free plan has a few limits per account: 1 template, 1 domain, 1 user (plus 1 accountant), 1 API token, 1 webhook, and 100 daily requests.”

Requires sales call

✗ No [7]mailersend.com/help/how-to-start-sending-emails“Send emails using the API · Navigate to the Domains page and click Manage next to the desired domain. · Create an API token. · When your API token is ready, and”

Enterprise plan

✓ Yes [8]mailersend.com/pricing“Our Free plan has a few limits per account: 1 template, 1 domain, 1 user (plus 1 accountant), 1 API token, 1 webhook, and 100 daily requests. To increase your”checkthat.ai/brands/mailersend/pricing

• Transactional send
• Inbound parsing
• Templates
• Batch send
• Scheduled send
• SMTP relay
• Dedicated IP
• Email validation
• Analytics

Supported actions

send_email, send_bulk_email, get_bulk_email_status, send_sms, schedule_email, list_domains, get_domain, create_domain, delete_domain, update_domain_settings, get_domain_dns_records, verify_domain, get_domain_recipients, list_templates, get_template, create_template, update_template, delete_template, list_recipients, get_recipient, delete_recipient, list_blocklist, list_hard_bounces, list_spam_complaints, list_unsubscribes, list_on_hold_recipients, add_to_blocklist, add_to_hard_bounces, add_to_spam_complaints, add_to_unsubscribes, delete_from_blocklist, delete_from_hard_bounces, delete_from_spam_complaints, delete_from_unsubscribes, delete_from_on_hold_list, verify_single_email, verify_email_async, get_async_verification_status, list_email_verifications, get_email_verification, verify_email_verification_list, get_email_verification_results, create_email_verification_list, get_domain_activity, get_activity_detail, list_webhooks, get_webhook, create_webhook, update_webhook, delete_webhook, list_sms_webhooks, get_sms_webhook, create_sms_webhook, update_sms_webhook, delete_sms_webhook, list_inbound_routes, get_inbound_route, create_inbound_route, update_inbound_route, delete_inbound_route [9]developers.mailersend.com/api/v1/recipientsdevelopers.mailersend.com/api/v1/inbounddevelopers.mailersend.com/api/v1/email-verificationdevelopers.mailersend.com/api/v1/webhooksdevelopers.mailersend.com/api/v1/sms-webhooksdevelopers.mailersend.com/api/v1/activitydevelopers.mailersend.com/api/v1/email“This endpoint allows you to start sending emails through the MailerSend Email API. Send an email. This endpoint allows you to send an asynchronous email.”developers.mailersend.com/api/v1/smsdevelopers.mailersend.com/api/v1/domainsdevelopers.mailersend.com/api/v1/templates

Regions

European Union [10]mailersend.com/legal/privacy-policy“Our data storage centers are in the European Union and have an information storage security certificate (ISO 27001) as well as a certificate of IT service”mailersend.com/legal/terms-of-use“7.2. You can send transactional and marketing emails and / or SMS using MailerSend only if the content is created by you or you have the right to use it.”

Input types

application/json, SMTP relay, Base64-encoded file attachments [11]developers.mailersend.com/api/v1/email“This endpoint allows you to start sending emails through the MailerSend Email API. Send an email. This endpoint allows you to send an asynchronous email.”mailersend.com/features/smtp-relay“Easily add email to your stack with 7 official libraries and extensive API documentation.”mailersend.com/features/email-api“MailerSend is a transactional messaging service provider that offers a powerful email sending API and SMTP relay, built so that developers can integrate”

Output types

application/json [12]developers.mailersend.com/api/v1/email“This endpoint allows you to start sending emails through the MailerSend Email API. Send an email. This endpoint allows you to send an asynchronous email.”developers.mailersend.com/guides/setting-up-webhooks“When MailerSend sends a webhook event to your endpoint, it will include a JSON payload with information about the event.”

Webhooks

✓ Yes [13]developers.mailersend.com/api/v1/webhooks“Webhooks allow you to subscribe to real-time notifications about various events that occur in MailerSend.”mailersend.com/help/webhooks“You can create a webhook directly from your account. For example, an HTTP POST callback is sent to your provided URL with a payload about the sent email.”developers.mailersend.com/api/v1/sms-webhooks“SMS Webhooks allow you to subscribe to real-time notifications about various SMS events that occur in MailerSend.”

Sandbox / test mode

✗ No [14]mailersend.com/help/how-to-test-email-sending-in-mailersend“Learn to test MailerSend's email capabilities using blackhole recipients. Including API, SMTP sending, webhooks, and activity tracking.”

SDK languages

Node.js, PHP, Python, Go, Ruby, Java [15]mailersend.com/features/smtp-relay“Easily add email to your stack with 7 official libraries and extensive API documentation.”developers.mailersend.com/guides/sdk/sending-emails-with-mailersend-and-nodejs“This guide will walk you through the steps required to set up a sample Node.js app that uses the MailerSend SDK to send emails.”

MCP server

✓ Yes [16]mailersend.com/help/how-to-connect-mailersends-mcp“The MailerSend MCP (Model Context Protocols) server can be integrated with your AI tools in just a few steps—no downloads or extensive configuration needed.”

SOC 2

Unknown [17]mailersend.com/legal/security-statement“Learn how MailerSend ensures the security of your data with industry-best practices, certifications, and compliance with GDPR.”

HIPAA

✗ No [18]paubox.com/blog/can-i-use-mailersend-and-be-hipaa-compliant“While we found references to their stance on GDPR compliance, we did not find anything when it came to HIPAA, BAA, or PHI.”

GDPR

✓ Yes [19]mailersend.com/legal/how-mailersend-stays-gdpr-compliant“We have all the necessary documents and GDPR-appropriate technical and organizational measures in place to ensure a high level of personal data protection.”mailersend.com/legal/security-statement“Learn how MailerSend ensures the security of your data with industry-best practices, certifications, and compliance with GDPR.”

ISO 27001

✓ Yes [20]mailersend.com/legal/privacy-policy“Our data storage centers are in the European Union and have an information storage security certificate (ISO 27001) as well as a certificate of IT service”

PCI DSS

✗ No [21]mailersend.com/legal/security-statement“Learn how MailerSend ensures the security of your data with industry-best practices, certifications, and compliance with GDPR.”

Published SLA

✓ Yes [22]mailersend.com/legal/service-level-agreement“MailerSend will use commercially reasonable efforts to make our Service available with a Monthly Uptime Percentage of at least 99.5% during any”

Rate limits

POST /v1/email: 120 requests/min; POST /v1/bulk-email: 10 requests/min (Free/Hobby), 15 (Starter), 30 (Professional), 60 (Enterprise); All other API requests: 60 requests/min; GET /v1/activity: 10 requests/min; SMTP: 120 requests/min; daily API quota: 100/day (Free/Trial), 1,000/day (Hobby), 100,000/day (Starter), 500,000/day (Professional/Enterprise) [23]developers.mailersend.com/general“The default rate limit is 120 requests per minute for /email endpoints, 10 requests per minute for /bulk-email endpoints and 60 requests per”mailersend.com/help/rate-limits-how-to-reduce-403-422-429-errors“Learn to manage MailerSend's API rate limits and quotas to avoid 403, 422, and 429 errors effectively.”

Known restrictions

Services are strictly for commercial use; personal, family, or household use is prohibited (Section 1.4, Terms of Use)., SMS is restricted to US and Canada phone numbers only., Free/Trial plan does not allow overage sending beyond the included email allowance., Prohibited content categories include: loans, gambling, cryptocurrency, cannabis, alcohol, tobacco/vape, firearms, pornography, escort services, weight loss material, pyramid schemes, forex, affiliate marketing, purchased/rented email lists, and more (Section 7.1, Terms of Use)., Creating multiple accounts is forbidden (Section 11, Terms of Use)., Services are not provided to customers registered in countries/regions sanctioned by the US, UK, EU, or UN (Section 1.3, Terms of Use)., Bulk email limited to 500 messages per request on paid plans, 5 on Trial., Email recipients limited to max 50 to, 10 cc, 10 bcc per message., Email attachments max 25 MB each after Base64 decoding., Custom headers and list-unsubscribe are Professional and Enterprise accounts only., In-Reply-To and References fields are paid plans only. [24]mailersend.com/legal/terms-of-use“7.2. You can send transactional and marketing emails and / or SMS using MailerSend only if the content is created by you or you have the right to use it.”mailersend.com/help/plans-features-and-limits“Free plan allows you to send up to 500 emails a month for free, with a daily limit of 100 emails.”

• Docs
• llms.txt
• Status page

Docs rendering: static · llms.txt present

API style

rest

Base URL

https://api.mailersend.com/v1/

Version

v1

Versioning

url

Stability

ga

Auth methods

api_key

Error format

vendor-specific

Webhook signing

hmac_sha256

Rate limit

60 / minute

SDKs

• Node.js mailersend · repo · updated 2026-06 · 173★
• PHP mailersend/mailersend · repo · updated 2026-06 · 83★
• Python mailersend · repo · updated 2026-06 · 69★
• Go github.com/mailersend/mailersend-go · repo · updated 2026-04 · 36★
• Ruby mailersend-ruby · repo · updated 2026-04 · 9★
• Java com.mailersend:java-sdk · repo · updated 2026-05 · 31★

• Auth docs
• Quickstart
• MCP server
• Webhook events

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• Amazon Simple Email Service

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• Postmark

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See all Email APIs APIs →

Each field above carries a numbered source — hover for a preview, click to jump here.

1. ↑Description: developers.mailersend.com
2. ↑Pricing model: checkthat.ai · mailersend.com · mailersend.com
3. ↑Published pricing: mailersend.com · checkthat.ai
4. ↑Free tier: mailersend.com · mailersend.com
5. ↑Free tier details: mailersend.com · mailersend.com
6. ↑Self-serve signup: mailersend.com · mailersend.com
7. ↑Requires sales call: mailersend.com
8. ↑Enterprise plan: mailersend.com · checkthat.ai
9. ↑Supported actions: developers.mailersend.com · developers.mailersend.com · developers.mailersend.com · developers.mailersend.com · developers.mailersend.com · developers.mailersend.com · developers.mailersend.com · developers.mailersend.com · developers.mailersend.com · developers.mailersend.com
10. ↑Regions: mailersend.com · mailersend.com
11. ↑Input types: developers.mailersend.com · mailersend.com · mailersend.com
12. ↑Output types: developers.mailersend.com · developers.mailersend.com
13. ↑Webhooks: developers.mailersend.com · mailersend.com · developers.mailersend.com
14. ↑Sandbox: mailersend.com
15. ↑SDK languages: mailersend.com · developers.mailersend.com
16. ↑MCP server: mailersend.com
17. ↑SOC 2: mailersend.com
18. ↑HIPAA: paubox.com
19. ↑GDPR: mailersend.com · mailersend.com
20. ↑ISO 27001: mailersend.com
21. ↑PCI DSS: mailersend.com
22. ↑Published SLA: mailersend.com
23. ↑Rate limits: developers.mailersend.com · mailersend.com
24. ↑Known restrictions: mailersend.com · mailersend.com

Every field change, who made it, and when — from our audited data pipeline and editors.

1. 2026-06-08 Status Page URL: (none) → https://status.mailersend.com
2. 2026-06-08 Docs URL: (none) → https://developers.mailersend.com
3. 2026-06-08 Llms Txt Present: (none) → Yes
4. 2026-06-08 Llms Txt URL: (none) → https://www.mailersend.com/llms.txt
5. 2026-06-08 Rendering: (none) → static
6. 2026-06-07 Summary Md: (none) → MailerSend is a transactional email platform built for developers but accessibl…
7. 2026-06-07 SDK Packages: Node.js, PHP, Python, Go, Ruby, Java → Node.js, PHP, Python, Go, Ruby, Java
8. 2026-06-07 Github Stars: (none) → 173
9. 2026-06-07 Github Stars At: (none) → 2026-06-07T18:55:30.898Z
10. 2026-06-07 MCP URL: (none) → https://mcp.mailersend.com/m
11. 2026-06-07 Quickstart URL: (none) → https://developers.mailersend.com/guides/sdk/
12. 2026-06-07 Error Format: (none) → vendor-specific
13. 2026-06-07 Webhook Signing: (none) → hmac_sha256
14. 2026-06-07 Webhook Events URL: (none) → https://developers.mailersend.com/api/v1/webhooks
15. 2026-06-07 Rate Limit Requests: (none) → 60
16. 2026-06-07 Requires Verification: (none) → No
17. 2026-06-07 SLA URL: (none) → https://www.mailersend.com/legal/service-level-agreement
18. 2026-06-07 Starting Price Usd: (none) → 7
19. 2026-06-07 Price Basis: (none) → month
20. 2026-06-07 Free Tier Limit: (none) → 500 emails/month
21. 2026-06-07 Fields Not Found: (none) → ga_date, launched_at, idempotency_supported
22. 2026-06-07 SDK Languages: PHP, Laravel, Node.js, Golang, Python, Ruby, Java → Node.js, PHP, Python, Go, Ruby, Java
23. 2026-06-07 Rate Limit Window: (none) → minute
24. 2026-06-07 API Version: (none) → v1
25. 2026-06-07 Versioning Scheme: (none) → url
26. 2026-06-07 Stability: (none) → ga
27. 2026-06-07 Auth Methods: (none) → api_key
28. 2026-06-07 Auth Docs URL: (none) → https://developers.mailersend.com/general
29. 2026-06-07 API Style: (none) → rest
30. 2026-06-07 Base URL: (none) → https://api.mailersend.com/v1/
31. 2026-06-07 SDK Packages: PHP, Laravel, Node.js, Golang, Python, Ruby, Java → Node.js, PHP, Python, Go, Ruby, Java
32. 2026-06-07 SDK Packages: (none) → PHP, Laravel, Node.js, Golang, Python, Ruby, Java
33. 2026-06-07 Capabilities: {"smtp":true,"inbound":true,"analytics":true,"templates":true,"batch_send":true… → {"smtp":true,"inbound":true,"analytics":true,"templates":true,"batch_send":true…