Stalwart Mail Server | Support by cloudimg

This is a repackaged open source software product wherein additional charges apply for cloudimg support services.

Overview Stalwart is the modern all-in-one open source mail server written in Rust: an SMTP server with inbound delivery, submission and relaying, an IMAP4 and JMAP server for mailbox access, a built-in spam and phishing filter, DKIM signing, SPF, DMARC and ARC verification, sieve scripting, and a full web administration console - all in a single efficient binary. This image delivers Stalwart fully installed and configured so a complete private mail platform is running within minutes of launch. The current release available is Stalwart 0.16.

Application Stack The Stalwart server runs as a hardened systemd service with its RocksDB datastore (mail spool, accounts, message blobs and full-text index) on a dedicated EBS volume. Mail protocols listen on the standard ports - SMTP 25, submission 587, submission over TLS 465 and IMAP over TLS 993 - while the web admin console and JMAP interface are served on port 80 through an nginx reverse proxy. A self-signed TLS certificate is generated per instance for the mail listeners and the guide covers replacing it with a Let's Encrypt certificate via Stalwart's built-in ACME support.

Secure By Default No default or shared credentials ship in the image. On the first boot of your instance a one-shot service generates a unique administrator password, regenerates the TLS private key, and writes the login to a root-only file. The admin console and management API reject unauthenticated access.

Important - outbound port 25 on EC2 AWS blocks outbound SMTP on port 25 by default for all new EC2 accounts. Receiving mail and IMAP access work out of the box; to send mail directly you can request the port 25 restriction removal from AWS support, or relay outbound mail through a smart host such as Amazon SES on port 587 - the user guide walks through both options.

Ready To Use Sign in to the web admin console, add your first domain - Stalwart generates the DKIM keys and shows you the exact DNS records to publish - create mailboxes, and connect any IMAP or JMAP mail client.

cloudimg Support 24/7 technical support by email and chat for deployment, domain and DNS setup, DKIM/SPF/DMARC, TLS certificates, SES relaying and upgrades.

Stalwart is a trademark of its respective owner. All product and company names are trademarks or registered trademarks of their respective holders. Use of them does not imply any affiliation with or endorsement by them.