MailSlurp was one of the first REST APIs for creating and managing email inboxes. It has a large SDK ecosystem and good documentation. AgentMailr was built specifically for AI agent workflows. Here is how they compare.
Feature Comparison
| Feature | MailSlurp | AgentMailr |
|---|---|---|
| REST API | Yes | Yes |
| OTP extraction (parsed) | No (raw email only) | Yes (JSON: otp_codes[]) |
| Long-poll OTP endpoint | No | Yes |
| MCP server | No | Yes (stdio + HTTP) |
| Verification link extraction | No | Yes |
| Email category detection | No | Yes (AI-powered) |
| Send email | Yes | Yes |
| Webhooks | Yes | Yes |
| Custom domains | Paid | Yes |
| Pricing model | Per-email | Flat rate |
The AI Agent Difference
MailSlurp returns the full raw email. Your code then needs to extract the OTP using regex, find verification links, and detect the email category. AgentMailr does this automatically. Every email response includes parsed.otp_codes, parsed.verification_links, and parsed.category as structured data.
MCP Integration
AgentMailr ships a native MCP server. Claude, Cursor, and other MCP-compatible AI tools can connect directly without writing any glue code. MailSlurp has no MCP support.
Choose AgentMailr If
- You are building AI agent workflows
- You need parsed OTP and link extraction
- You want an MCP server for Claude or Cursor
- You prefer flat-rate pricing over per-email billing