Plunk
7.1#20 in transactional email servicesFree planFree planWebAPISelf-hosted
VisitPlunk vs Postmark
What both publish
| Fact | Plunk | Postmark |
|---|---|---|
| Free plan | Yes | Yes |
| Integrations | Plunk offers a REST API, SDKs including Node.js and Python, SMTP support, webhooks, and an MCP server that works with MCP clients such as Claude Code, Claude Desktop, and Cursor. | Official integrations include Slack, Zapier, Stripe, WordPress, Supabase, Bubble, Craft CMS, Netlify, and Gravity Forms. |
| Support | The maker invites customer feedback and lists a Discord community on its site. | Postmark offers support by email, live chat, and one-on-one calls and reports a 95% customer happiness rating. |
Plunk plans
- FreeFree
- Free foreverFree
- Pay as you growFree
Postmark plans
- FreeFree
- Basic$15 a month
- Pro$16.50 a month
- Platform$18 a month
- Custom activity retention$5 a month
- DMARC monitoring$14 a month
Pick Plunk if…
You want what its maker publishes above — check its page for the details.
Pick Postmark if…
Postmark suits developers who need to send application email through an API or SMTP and track delivery events. Its inbound processing and message streams also suit services handling both incoming and different types of outgoing email.