This is the complete documentation set for the current release. Start with the overview, follow the installation guide, and keep the administrator manual to hand.
What it does, what it works with, who it is for, requirements.
Deploy the appliance, run the setup wizard, connect Microsoft 365, configure your printers, verify.
Day-to-day: routes, settings, held and failed scans, updates, backups, logs, troubleshooting.
Architecture, routing rules, Microsoft Graph integration, security model, limits.
What changed in each release.
| Inbound | SMTP on your LAN, port 2525 by default (25 supported), no authentication, no TLS required |
|---|---|
| Outbound | HTTPS only, to login.microsoftonline.com, graph.microsoft.com and licence.smtp-365.com (activation, a licence check at every relay start and once a day, updates). These are the only connections the product makes by itself. Operating-system updates (from 0.3.8) are fetched only when your administrator asks for them on the Software update page: that needs outbound HTTP to deb.debian.org and security.debian.org. Debian's own automatic updates are not installed; if you add them, SMTP-365 does not manage them |
| Permissions | Mail.Send, Sites.Selected (one SharePoint site) and, only if large attachments are switched on, Mail.ReadWrite; application-only. The mail permissions can be restricted to the scanner mailboxes with the Exchange scope shown during setup (recommended); the appliance can check that it is in force |
| Resources | 1 vCPU, 2 GB RAM, 16 GB disk (thin), a LAN IP via DHCP or static |
| Admin | HTTPS web interface on the appliance; no agents, no cloud console |
Support: helpdesk@smtp-365.com