Switch from Resend to Mailcheer by changing one URL and one key
Resend, the email sending API for developers.
Mailcheer accepts the same fields as Resend's API. Your code stays in place, and your campaigns are then planned on a three-month calendar, with an assistant that writes them with you.
Why switch to Mailcheer
- The same fields as Resend's API: to migrate, you change the base URL and the key.
- A three-month calendar: drag a draft onto a date and it sends itself.
- An assistant that writes your newsletters in a conversation, with live web search.
- An MCP server for Claude Code, ChatGPT, Codex and Cursor, and signed webhooks.
Mailcheer takes Resend's API fields as they are: attachments, CC, BCC, reply_to and tags arrive in the same format. One line of configuration changes, and the rest of your code stays in place. In Mailcheer, your campaigns then sit on a three-month calendar, an assistant writes them with you, and an MCP server opens them to Claude Code, ChatGPT, Codex and Cursor.
Feature by feature
| What we look at | Mailcheer | Resend |
|---|---|---|
| Editorial calendar | A three-month calendar: drag a draft onto a date and it sends itself. | Each send is scheduled individually. |
| Attachments | The same attachments field, the same base64 encoding. | Supported. |
Everything written here about Resend comes from their public documentation, checked on September 20 and 21, 2026. No Resend pricing is quoted: it changes. The format compatibility with Mailcheer is described in the API reference.
Our verdict
Choose Mailcheer: you keep your code, change one URL and one key, and plan your campaigns three months ahead. 3,000 emails a month are free, no credit card.
Try it with your own integration
3,000 sends a month free, no credit card. Coming from Resend: change the base URL and the key in your HTTP client, and you are sending.
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