--- title: Handoff 365 — Secure External File Upload to SharePoint description: Handoff 365 empowers secure, verified file exchange with external partners in SharePoint Online. Streamline collaboration, automate compliance, and protect sensitive documents—no tenant access required. Fast, secure, and easy to use. url: https://www.malachis.eu/en-US/handoff-365 modified: 2026-03-27 --- ## Handoff 365 — Secure File Exchange for Microsoft 365 Stop emailing sensitive files back and forth. Start exchanging them securely. Handoff 365 is a turnkey secure file exchange solution built natively on Microsoft SharePoint and the Microsoft 365 ecosystem. It lets external partners upload files directly to your SharePoint document libraries — verified, organized, and secured — without giving them access to your tenant. ### **The Problem** Every team that works with external partners knows the pain: files arrive by email in various formats, get lost in overflowing inboxes, exceed mailbox size limits, and nobody knows if the right version was received. Sharing OneDrive links with external users means granting access you can't easily control. Sensitive documents — contracts, invoices, identity documents — bounce through unencrypted email servers with no audit trail. ### **The Solution** Handoff 365 generates secure, time-limited handoff links that let verified external partners upload files directly into your SharePoint Online document libraries. One-time verification codes, configurable file constraints, and automatic metadata tagging keep everything organized, compliant, and under your control. ### **Key Features** **Secure One-Time Links** — Generate unique handoff links with configurable expiry (1–30 days). Each link is cryptographically secured and scoped to a specific SharePoint folder. No tenant access required for partners. **Email Verification with OTP** — Partners verify their identity with a 6-digit one-time code sent to their email. No passwords to manage. No guest accounts to provision. Rate-limited to prevent brute force. **Direct SharePoint Upload** — Files land directly in your SharePoint Online document library. Tagged automatically with partner name, email, and handoff ID. Your existing permissions, retention policies, and compliance rules apply immediately. **Configurable File Constraints** — Control maximum file size, allowed file types, and total file count per handoff. MIME type validation with magic byte verification prevents disguised malicious files. **Drag & Drop Interface** — Partners get a clean, branded upload page with drag-and-drop support, upload progress bars, and instant confirmation. No training needed. **Built-In File Preview** — Partners can preview uploaded files directly in the browser via SharePoint's document viewer. Optional — disable it per handoff if needed. **File Comments** — Partners can add comments to uploaded files for additional context. No more "see attached" emails with zero explanation. **Custom Messages** — Include instructions or context on the handoff page. Tell partners exactly what you need and in what format. **API-First Design** — Create handoff links programmatically from any app — SPFx web parts, Azure Functions, or a simple API call. Full REST API with Swagger documentation. **Multi-Language Support** — Available in English, Czech, and Slovak — ready for Central European teams. **Enterprise-Grade Security** — Helmet security headers, CORS restrictions, rate limiting on all endpoints, timing-safe authentication, file name sanitization, and complete audit trail in SharePoint metadata. ### **Why Handoff 365?**   Traditional Process **Handoff 365** File receipt Email attachments, size limits **Direct SharePoint upload, configurable limits** Partner verification Trust the sender address **OTP email verification** File organization Manual sorting into folders **Auto-tagged with metadata** Access control Guest accounts, shared links **Scoped one-time links, no tenant access** File validation Hope for the best **MIME type + magic byte verification** Audit trail Search your inbox **SharePoint metadata + handoff ID** Integration Forward emails manually **REST API, Azure Functions, SPFx** ### **Built on What You Already Have** Handoff 365 runs natively on Microsoft SharePoint Online. No separate file storage. No third-party cloud accounts for your partners. No additional SaaS subscriptions eating your budget. It integrates seamlessly with Microsoft 365 & SharePoint Online, Microsoft Graph API, Azure Functions, SPFx Web Parts, and your existing document libraries and compliance policies. Your data stays in your Microsoft 365 tenant. You own it. Full control. Full compliance. ### **Who Is It For?** Companies receiving files from external partners, clients, or vendors regularly. Finance teams collecting invoices, contracts, or tax documents from suppliers. HR departments gathering onboarding documents from new hires. Legal teams exchanging sensitive documents with outside counsel. IT departments looking to eliminate uncontrolled file sharing via email. Organizations on Microsoft 365 wanting to maximize their SharePoint investment. ### **Ready to See It in Action?** Book a personalized demo and see how Handoff 365 can secure your external file exchange. [Get in touch →](/contact) * * * ### **About this pricing** Handoff 365 is a managed SaaS service — we handle hosting, infrastructure, and updates. You pay a monthly or annual subscription per tenant. - **Monthly** gives you full flexibility. Cancel with 30 days notice. - **Annual** saves you two months compared to paying monthly. One subscription covers your entire tenant — no per-user fees, no limits on the number of handoff links you create or external partners you work with.