Mailcatcher docker image

Lightweight Alpine-based Docker image for MailCatcher with a smaller runtime footprint than sj26/mailcatcher.

Supported architectures

linux/arm/v6 linux/arm/v7 linux/arm64/v8 linux/amd64

As of April 15, 2026, the linux/arm64 image is roughly half the size of sj26/mailcatcher on Docker Hub.

Quickstart

1. Run: docker run -d -p 1080:1080 -p 1025:1025 --name mailcatcher darkniki/mailcatcher

2. Open your browser at http://<docker-host-ip>:1080

Local development

• docker compose build builds the image from build/.
• docker compose up starts MailCatcher locally on ports 1080 and 1025.