Obsidian SuiteDocumentation

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Mail server for organizations

Obsidian Mail Server documentation

Installing and running the server: domains, people, apps and phones, mail flow, compliance, updates and backups. About Obsidian Mail Server

Start here

Getting startedThe five steps from a fresh server to people using mail.Installing the serverInstaller ISO, Hyper-V, VMware, and the first-boot setup.Domains and DNSAdding a domain and the DNS records that make mail and apps work.CertificatesReplacing the self-signed certificate, with Let's Encrypt or your own.

People

Users, mailboxes and groupsMailboxes, shared mailboxes, rooms, groups, contacts, addresses and limits.Active Directory Next releaseImporting users and groups from AD, keeping them in sync, and Windows passwords.Shared access and delegationLetting people open, send as, or send on behalf of another mailbox.Public foldersFolders for the whole organization: permissions, posting, receiving mail.Administrators and change historyThe five administrator roles and the record of every change.

Apps and devices

Connecting phones, Macs and appsiPhone, Android, Mac Mail, Outlook, Thunderbird and manual settings.Phones and tabletsDevice security rules, blocking and remote erase.Webmail for usersWhat people can do at /mail: mail, calendar, rules, automatic replies.

Mail flow

Mail flow, relays and the queueHow mail leaves the server, relay hosts, internal apps, and delayed mail.Email signing (DKIM)Signing outgoing mail so receivers can trust it came from you.Mail flow rulesTag, change, copy, redirect or block mail as it passes through the server.

Compliance

Data loss preventionKeeping card numbers, bank details and ID numbers from leaving by email.Retention policiesHow long mail is kept: deleting and archiving by age.eDiscoveryFinding, keeping and handing over mail for legal cases.HoldsKeeping mail that may be evidence, whatever gets deleted.Mailbox audit logWho deleted, moved, changed or sent what, in which mailbox.JournalingRecording who sent and received what, for auditors and regulators.

Running the server

Managing the server itselfNetwork, disks, updates, logs and backups of the machine, from here or its console.Updates and backupsKeeping the server up to date, and backing up and restoring it.TroubleshootingMail not arriving, apps not connecting, and where the logs are.Security notesWhat the server protects, and what to add in front of it.

Reference

Configuration fileEvery setting in /etc/obsidian-mailserver/appsettings.json.Command-line referenceThe oms command on the server, for scripting and recovery.