SMTP-365 is a small relay that runs on your network. Printers and other legacy devices keep sending plain SMTP exactly as they always have; SMTP-365 delivers it to Microsoft 365 securely with modern authentication, and can file scans straight into SharePoint.
One-time licence per appliance with 12 months of updates included. No per-user or per-device fees.
Multi-function printers only speak legacy SMTP, usually with no authentication and often no TLS. Exchange Online now refuses that, so scan-to-email quietly stops working.
UPS units, server management cards, NAS boxes and phone systems all email their warnings the same way. When they can't, you don't find out until something has already failed.
Turning security settings back on, exposing SMTP relays, or hand-building OAuth2 connectors per device: fragile, risky, and a job nobody wants to own.
Change the SMTP server on your printer or device to the relay's address. No username, no password, no certificates. That's the only change your devices ever need.
Every message is written to disk, then sent to Microsoft 365 using an application identity that holds only Mail.Send and Sites.Selected. Temporary Microsoft outages are retried automatically.
Messages are sent from a mailbox you choose. Scans addressed to name@sharepoint.local are converted to PDF and filed in the SharePoint folder you mapped in the browser.
The email relay path serves every legacy SMTP source. Scan-to-SharePoint is the document-centric extra that makes it shine on multi-function printers.
Scan to email, or straight into a SharePoint folder as a PDF. Any brand that can send SMTP.
APC, Eaton and others: power, battery and self-test alerts keep arriving.
HP iLO, Dell iDRAC, Lenovo XClarity hardware and health notifications.
Synology, QNAP and others: backup, disk and job reports.
PBX and VoIP voicemail-to-email and system alerts.
Access control, alarm panels and building-management notifications.
Any tool or line-of-business application that emails reports over SMTP.
Send everything from one fixed, trusted address, so alerts from a UPS or iLO still land properly.
Map addresses to folders with a live folder picker. TIFF, JPEG and PNG scans become one multi-page PDF; PDFs pass straight through.
Every message is spooled before the device is told "accepted". Retries with back-off, held scans for unmapped addresses, and alert emails to the admin on failure.
Sign in once as a Global Administrator; the appliance registers its own app with just two permissions. No PowerShell. Verified publisher: Interop Solutions Ltd.
Only Mail.Send and Sites.Selected on one site. Optionally restrict sending to a single mailbox with an Exchange access policy.
HTTPS admin UI, firewall managed in the browser, backup and restore, logs, and one-click signed software updates.
Runs on your premises. Your documents go from your printer to your tenant and nowhere else. Licences are verified offline; the product keeps working without us.
Ready-made images for VMware, Hyper-V, Proxmox/KVM, plus a bootable installer ISO for any hypervisor or bare metal.
A signed package for your existing Debian or Ubuntu server, updated through apt.
A flashable image for Pi 4 and Pi 5 for small sites that want a tiny always-on box.
An MSI that installs SMTP-365 as Windows Services on an existing server.
One licence covers one installation of any edition.
One appliance or installation. Perpetual licence.
Prices in GBP. VAT may apply. Keys are emailed within one working day. Online checkout is on its way; orders are currently confirmed by email.
MSPs, print resellers and IT support firms: contact us for volume pricing and partner keys.
The relay keeps working indefinitely. Maintenance renewal unlocks updates released after your maintenance date; contact us for renewal pricing.
It runs entirely on your premises. Scans and alerts travel from your device to your Microsoft 365 tenant through the appliance and nowhere else. Interop Solutions never receives your mail. The only thing the appliance sends us is a licence activation record (licence id, appliance id, version) if you choose to activate online.
A Global Administrator to sign in once during setup, a mailbox to send from (a free shared mailbox is fine), and a SharePoint site if you want scan-to-SharePoint. The setup wizard creates the app registration for you with only Mail.Send and Sites.Selected.
Anything that can send email over SMTP to a server address you choose, with authentication and TLS turned off: printers, UPS units, iLO/iDRAC/XClarity, NAS, PBX and VoIP systems, alarms, monitoring tools and applications.
Today as a virtual appliance on VMware, Hyper-V, Proxmox/KVM or from a bootable ISO on any hardware. It needs about 1 vCPU, 2 GB RAM and a LAN address the devices can reach, plus outbound HTTPS to Microsoft. Linux package, Raspberry Pi and Windows Server editions are on the roadmap.
Messages are spooled to disk and retried with exponential back-off for about an hour, then kept for you to re-queue with one click. Nothing is dropped.
No. The 30-day evaluation is the full product. When it ends, scans are held rather than lost until a licence key is entered.