Mailcow

Self-hosted email server with webmail, anti-spam, and DKIM/DMARC support.

email smtp imap server self-hosted

Ports

Notes

Use Cases

Official Website View on GitHub

About

What Mailcow does

Mailcow is a fully featured self-hosted email server suite with a modern web UI (SOGo), Postfix, Dovecot, Rspamd anti-spam, ClamAV antivirus, and automatic SSL. It handles SMTP, IMAP, POP3, and includes a webmail interface with calendar and contacts.

Install Flow

How to self-host Mailcow

Mailcow can be deployed with standard Docker Compose using the Yantr app catalog. This page collects the basic information searchers usually need first: what Mailcow does, which Docker image Yantr uses, default ports, deployment notes, and where to find the original compose template.

After deployment, Yantr lets you publish additional ports from the stack page using Docker-style syntax. Use 8080:8080 for a fixed host port or just 8080 to let Docker assign a random port.

Use Cases

What people run it for

Run your own email server with full control over your data — SMTP, IMAP, POP3, webmail, calendar, and contacts in one stack.
Replace Google Workspace or Microsoft 365 email hosting with a self-hosted solution on your own domain.
Get built-in anti-spam via Rspamd, virus scanning via ClamAV, and automatic TLS certificate management.

Technical Details

Ports, image, and service metadata

Ports

Port	Protocol	Label
80	HTTP	Web UI
443	HTTPS	Web UI (HTTPS)
25	SMTP	SMTP
465	SMTPS	SMTPS
587	SMTP	Submission
143	TCP	IMAP
993	TCP	IMAPS

Docker Image

ghcr.io/mailcow/postfix:latest

Service Name

mailcow-mailserver

Notes

Things to know before you deploy

Run ./generate_config.sh from the repo to initialize mailcow.conf with your hostname and secrets.
Minimum 2.5 GB RAM (disable ClamAV below this threshold).
Default admin credentials are admin / moohoo — change immediately.
Requires a domain with MX, A, SPF, DKIM, and DMARC DNS records configured.

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