How to Send Large Files to a Corporate Intranet via Email — Secure, Scanned, One-Way Delivery

Your client needs to send you a 120MB design package. Your corporate firewall blocks cloud links. IT won't grant VPN access to outside vendors. FTP is long gone. How do you get large files into your company network — securely, without punching holes in your defenses?

Use email. It's the one channel that already passes through your company's security stack. SendSplit delivers files up to 200MB as real email attachments — every byte scanned by your corporate email security system before it reaches any employee's inbox. One-way inbound delivery. No cloud links. No data leakage risk.

Why Email Is the Safest Inbound File Channel

Corporate networks are designed to be hard to penetrate. Firewalls, VPNs, endpoint protection, and zero-trust policies — these all boil down to one principle: trust nobody by default, verify everything before granting access. These defenses keep threats out, but they also make it frustratingly difficult for external partners, vendors, and clients to send you large files.

Cloud sharing links (Google Drive, Dropbox, OneDrive, WeTransfer) create a problem: they bypass your email security gateway entirely. When an employee clicks a cloud link, the file downloads directly from an external server — your email security system never inspects it. IT departments rightfully distrust this workflow.

Think of it this way: A cloud link is like letting a stranger walk past the security desk and straight into your building. An email attachment is like handing a package to the security guard, who opens it, inspects everything, and only then delivers it to your desk.

Email attachments flow through your company's existing security infrastructure, checked at every layer:

• Antivirus scanning — Every attachment is scanned for malware, trojans, and ransomware before delivery. In plain terms: if a file contains a virus, it gets blocked before it ever reaches your inbox.
• Sandbox analysis — Advanced email security systems (Proofpoint, Mimecast, Microsoft Defender for Office 365, Barracuda) place attachments in an isolated virtual environment to observe their behavior before allowing them through. This catches brand-new threats that antivirus databases haven't cataloged yet — known as "zero-day attacks."
• DLP (Data Loss Prevention) — Inbound attachments are automatically inspected to ensure they comply with corporate data policies. For example, files containing sensitive information like ID numbers or financial data can be flagged or blocked.
• Spam and phishing filters — The email itself is checked for social engineering attempts — fraudulent messages that impersonate someone you trust and try to trick you into clicking malicious links.
• Audit trail — Every inbound email with attachments is fully logged — who sent it, when it arrived, what was attached. All searchable and traceable. If something goes wrong, there's always a record.

This is why email remains the most trusted inbound file delivery channel in enterprise environments.

The Problem: Email Attachment Size Limits

The security advantage of email is clear. The problem is size. Most corporate email systems cap attachments between 10MB and 25MB:

• Microsoft Exchange / Office 365 — Default 25MB limit (some orgs set it lower to 10MB)
• Google Workspace — 25MB attachment limit
• On-premise Exchange — Often configured at 10MB or 15MB by IT
• Lotus Notes / HCL Domino — Typically 10MB–25MB depending on configuration
• Zimbra, Postfix, other enterprise mail — Varies, usually 10MB–25MB

When a vendor or client needs to send you a 50MB, 100MB, or 200MB file, email simply bounces it back. The file never makes it into your network.

How SendSplit Solves This — Securely

SendSplit breaks large files into email-friendly parts that fit within your corporate email limits. Each part arrives as a real email attachment — fully scanned by your email security system before delivery.

One-Way Inbound: No Data Leakage Risk

This is the key point for IT and compliance teams:

SendSplit only sends files INTO the corporate network. It cannot extract files out.

Think of it as a mailroom: SendSplit is like your company's receiving dock — it only accepts incoming deliveries. It cannot ship anything out. No internal data ever leaves through this channel.

• The sender uploads a file and enters the recipient's corporate email address
• Files are delivered as inbound email attachments via standard SMTP
• The corporate email system receives, scans, and delivers the attachments
• At no point does the recipient's data leave the corporate network

Unlike cloud sharing platforms (which require employees to upload files to external servers), SendSplit's workflow is purely inbound. There is no outbound data flow, no external account for employees to log into, and no risk of accidental or intentional data exfiltration.

Why IT Departments Approve This Workflow

SendSplit doesn't require any changes to corporate infrastructure:

• No firewall rules to modify — Uses standard SMTP (email), which is already allowed
• No VPN accounts to provision — External senders use SendSplit's web interface, not your network
• No cloud storage integration — No need to whitelist Dropbox, Google Drive, or other services
• No software to install — Recipients use their existing email client (Outlook, Thunderbird, webmail)
• Full visibility — IT can see every inbound email with attachments in their email logs
• Existing policies apply — Corporate attachment size limits, DLP rules, and security scans all function normally. SendSplit doesn't bypass any of your security layers

Who Needs This?

• Vendors and suppliers sending product specs, CAD files, or manufacturing data to procurement teams
• Clients delivering project assets, brand guidelines, or media files to agency employees
• Legal counsel sending large contract packages, discovery documents, or case files to corporate legal departments
• Auditors delivering audit reports, financial documents, and compliance evidence
• Construction and engineering partners sharing blueprints, BIM models, and inspection reports
• Healthcare partners sending imaging files, lab results, or clinical data (within compliance requirements)

Tips for Receiving Large Files via Corporate Email

• Coordinate with the sender — Tell them your company's attachment size limit (10MB, 20MB, or 25MB) so they choose the right split size in SendSplit
• Check your spam folder — Multiple emails with attachments may trigger spam filters; whitelist the sender if needed
• Download all parts before extracting — All split parts must be present to reconstruct the original file
• Use password protection — For sensitive files, ask the sender to enable SendSplit's optional password encryption
• Inform IT if needed — Let your IT team know you're expecting multiple attachment emails from an external sender

Stop wrestling with cloud links, FTP servers, and VPN access requests. Try SendSplit — deliver files up to 200MB as real email attachments that pass through your corporate security system. One-way. Scanned. Secure.