# Mailpit — AI Tool Profile
> Source: https://agentrobbies.com/tools/mailpit-sandbox
> Ecosystem: AGENTMAIL | Verified: 2026-10-11
> 100% Independent Listing • Zero Affiliate Links

## Description
Fast, lightweight open-source email testing server and API. Acts as an SMTP server and provides a web UI and REST API for testing AI agent outbound and inbound email pipelines completely offline.

## Access & Pricing
100% Free & Open Source (MIT License). Single binary or Docker container.

## Key Capabilities
- Zero external network dependency for safe local agent email loops
- REST API to query, inspect, and assert emails received during agent automated testing
- Supports HTML message rendering, headers inspection, and attachment downloads

## Alternatives & Replaces
- Accidental live emails sent during development and testing

## Robbie's Take
**Robbie's Hardware & Practical Fit:** Excellent candidate for local execution with zero cloud lock-in. For 7B-8B parameter models, budget at least 8 GB of unified memory or VRAM (Q4_K_M quantization). For 32B-70B models, aim for 24 GB+ to maintain interactive throughput without CPU offload penalties.

## Direct Link
https://mailpit.axllent.org