Developer docs · InboxRatio Editorial
MailerSend email API: SDKs, docs and limits (2026)
Every link below points into MailerSend's official developer documentation and was checked on 10 September 2026. We record only what the vendor documents — a field we could not verify at the source is left out, never guessed.
From MailerSend's official docs · checked 10 September 2026
Docs, SDKs and limits
- Developer docs
- developers.mailersend.com/
- API reference
- developers.mailersend.com/api/v1/email.html
- SDK languages
- GoJavaNode.jsPHPPythonRubyAs listed in MailerSend's official SDK docs
- SMTP relay
- Yes · SMTP docs
- Webhooks
- Webhook docs
- Rate limits
- 120 requests per minute to POST /v1/email and over SMTP, 60 per minute for other endpoints (10 per minute for bulk email and activity); daily request quotas run from 100 on trial accounts to 500,000 on Professional and Enterprise. Source
From our feature matrix — documented by the vendor
API, SMTP and sending auth
- API'flexible email API'
- SDKs / client libraries'7 SDKs, OpenAPI collection' on all plans — PHP, Laravel, Node.js, Go, Python, Ruby, Java (developers.mailersend.com)
- Public API docsPublic API/feature docs and help center with registrar-specific guides
- WebhooksWebhooks on all plans — 1 on Free/Hobby, 50 on Starter, unlimited on Professional
- SMTP APISMTP relay from Hobby plan up
- SMTP relay'Email API and SMTP relay' — SMTP from the paid Hobby plan up
- Transactional emailCore product — 'help you collaborate on transactional emails'
- SPF assistanceSPF record supplied at domain verification with registrar-specific instructions
- DKIM setup'2048-bit DKIM keys for stronger security, so you'll see two DKIM CNAME records to add instead of one'
- DMARC support'DMARC monitoring tool enables you to create a DMARC record for your domain and monitor activity with reports' (30 days free on Starter; included on Professional)
Features checked 10 September 2026. ✓ documented · ◐ limited or plan-gated · × documented as absent · — not documented. Documentation is not a measured result — see our methodology.
Pricing snapshot
Generated from our datasets — every value verified and dated
Frequently asked questions
Where are the official MailerSend API docs?
MailerSend's official developer documentation is at https://developers.mailersend.com/, and the API reference is at https://developers.mailersend.com/api/v1/email.html. Links checked on 10 September 2026.
Does MailerSend have an SDK for Python?
Yes. Python is among the SDK languages listed in MailerSend's official docs: Go, Java, Node.js, PHP, Python and Ruby (checked 10 September 2026).
Does MailerSend support SMTP relay?
Yes. MailerSend's official docs document SMTP relay sending: https://www.mailersend.com/help/smtp-relay (checked 10 September 2026).
What are the MailerSend API rate limits?
120 requests per minute to POST /v1/email and over SMTP, 60 per minute for other endpoints (10 per minute for bulk email and activity); daily request quotas run from 100 on trial accounts to 500,000 on Professional and Enterprise. Source: MailerSend's official documentation at https://developers.mailersend.com/general.html, checked 10 September 2026.
Does MailerSend offer webhooks?
Yes. MailerSend's official docs cover webhook event notifications: https://developers.mailersend.com/api/v1/webhooks.html (checked 10 September 2026).