MailerSend
Modern transactional API with a clean UI.
MailerSend was built by the same team behind MailerLite, focused on transactional. Drag-and-drop templates plus a code-first API cover both designer and engineer flows. Pricing is competitive at small to mid volume.
Judged purely as an API. What the request contract guarantees on retry, how complete the webhook event coverage is, whether suppressions are readable and writable programmatically, and how much the message log retains when something needs debugging in production.
Against high-frequency programmatic sends where a missed delivery is a product failure, MailerSend covers webhook coverage, event stream, the suppressions API, batch sending, and SDK breadth, and does not cover idempotency keys and operating track record. Whether that gap matters depends on how central those are to the build.
- Idempotency keys: No
- Webhooks: Yes
- Event stream: Yes
- Operating since: 2020
- Suppressions API: Yes
- Best published rate per 1,000: Tiers not published in comparable form
- Batch sending: Yes
- SDKs: node, python, go, ruby, php
- Deliverability: Good and steadily improving; reputation managed via dedicated IP options on paid plans.
Good and steadily improving; reputation managed via dedicated IP options on paid plans.
Teams that want both API and visual template editing.
- › Drag-and-drop templates plus API
- › Inbound routing supported
- › Sub-accounts for agencies
- › Smaller SDK footprint than SendGrid
- › Brand and ecosystem less recognized than older providers
Features at a glance
| API | Yes |
| SMTP | Yes |
| SDKs | node, python, go, ruby, php |
| Webhooks | Yes |
| Templates | rich |
| React Email | No |
| Batch send | Yes |
| Scheduled send | Yes |
| Suppressions | Yes |
| Multi-tenant | Yes |
| Inbound parsing | Yes |
| Event stream | Yes |
| Idempotency keys | No |
| Dedicated IP | Yes |
Appears in rankings
13 Best Transactional Email APIs (2026), Tested
Clean modern API and visual builder. Smaller ecosystem than the giants.
7 Best Email Tools for Developer Experience (2026), Tested
Modern API, clean dashboard, drag-and-drop plus code.
11 Best Email Tools With Permanent Free Tiers (2026), Tested
3,000/mo permanent.
10 Best Email Tools for Multi-Tenant SaaS (2026), Tested
Modern API and sub-account story for teams that want developer and client-facing surfaces together.
12 Best Mailchimp Alternatives (2026), Tested
Better Mandrill-style fit for teams that want transactional API plus visual templates.
7 Best Transactional Email Tools With Templates (2026), Tested
Strong visual templates and an approachable API for teams that do not want templates embedded in application code.