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Stalwart

Purpose: Open source SMTP server for cold email and transactional email delivery.

Last verified: December 2025

Account Details​

  • Notes: open source SMTP server for cold email
  • Category: SELF_HOSTING
  • Account type: INTERNAL
  • Created: December 2025
  • Account owner: Ben Power

Hosting​

Provider: Hetzner Cloud
Project: Stalwart SMTP (Project ID: 12629745)
Server: stalwart-smtp (Server ID: 114747176)
Public IP: 157.90.126.220
Location: Nuremberg, Germany (nbg1-dc3)

Server Specifications:

  • Type: CPX11
  • vCPUs: 2 cores (shared)
  • RAM: 2 GB
  • Disk: 40 GB (local storage)
  • Monthly Cost: €3.85
  • OS: Ubuntu 22.04

Firewall Configuration:

  • Firewall: stalwart-firewall (ID: 10261061)
  • Open Ports: SSH (22), SMTP (25), SMTP Submission (587), SMTPS (465), IMAP (143), IMAPS (993), POP3 (110), POP3S (995), HTTPS (443), HTTP Alt (8080), Stalwart Management (4190)

Infrastructure Details: See tools/hetzner.md for complete server configuration and management commands.