docker-mailserver

docker-mailserver is a Docker-based email server stack (typically Postfix/Dovecot + related components) for running an SMTP/IMAP mail server in containers, with configuration managed via environment variables and mounted volumes.

Evaluated Mar 30, 2026 (26d ago)

Homepage ↗ Repo ↗ Communication docker self-hosted email smtp imap mail-server postfix dovecot homelab

⚙ Agent Friendliness

/ 100

Can an agent use this?

🔒 Security

/ 100

Is it safe for agents?

⚡ Reliability

/ 100

Does it work consistently?

Score Breakdown

⚙ Agent Friendliness

MCP Quality

Documentation

Error Messages

Auth Simplicity

Rate Limits

🔒 Security

TLS Enforcement

Auth Strength

Scope Granularity

Dep. Hygiene

Secret Handling

Security depends heavily on your configuration (TLS certs, firewall rules, SPF/DKIM/DMARC, fail2ban/abuse controls, and timely updates). As a self-hosted mail server, it does not inherently provide fine-grained auth scopes or API-level protections; the operational security posture is the primary determinant.

⚡ Reliability

Uptime/SLA

Version Stability

Breaking Changes

Error Recovery

Best When

You want a self-hosted mail server in Docker for a limited domain/user set (homelab or small deployment) and can handle configuration, DNS, TLS, and ongoing ops.

Avoid When

You need turnkey reliability with minimal maintenance, strict compliance assurances without operational controls, or you cannot open inbound SMTP/IMAP and related ports securely.

Use Cases

• Self-hosting an email server for a domain
• Running a lightweight mail server for small teams/homelabs
• Providing SMTP+IMAP for internal services or personal domains
• Testing and prototyping email server setups using containers

Not For

• Production email service at large scale without operational expertise
• Use cases requiring a managed/fully hosted email provider SLA
• Environments where exposing inbound mail ports is not feasible
• Users unwilling to maintain security updates and perform ongoing configuration/monitoring

Interface

REST API

GraphQL

gRPC

MCP Server

SDK

Webhooks

Authentication

Methods: SMTP AUTH (configured via server settings) TLS client authentication is not typical; authentication is generally via SMTP credentials/IMAP credentials

OAuth: No Scopes: No

This is a mail-server container, not an app API. Auth is at the mail protocol level (SMTP/IMAP credentials) rather than app/API authentication.

Pricing

Free tier: No

Requires CC: No

Open-source containerized mail server; no vendor API pricing.

Agent Metadata

Pagination

none

Idempotent

False

Retry Guidance

Not documented

Known Gotchas

⚠ As a Docker/mail server, changes are typically configuration- and state-dependent (volumes, mail queues, accounts). LLM/agents should avoid assuming API-like stateless idempotency.
⚠ Operational tasks (DNS/MX records, TLS cert issuance/renewal, firewall/ports, log review) are required; an agent may need to interpret operational logs rather than structured API responses.
⚠ Mail delivery involves asynchronous behavior (queueing/delays), making success/failure non-immediate and not easily mapped to a single request/response.

Alternatives

Mailu Mailcow iRedMail Proxmox-based turnkey mail server solutions Managed email providers (Google Workspace, Microsoft 365, etc.)

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API endpoint ↗ Agent guide ↗ Report inaccuracy

Scores are editorial opinions as of 2026-03-30.