Closed Users

Keep all correspondence private.

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Email theft?

No more. Keep sensitive data exclusively between you and your intended party.


The key to preventing hacking and phishing is securing internal communications.


Keep your accounts safe on any device at home and at the office — no VPN is required.


Send large files right from your email, without third-party software.

Keep all communications private - free from spam and theft. Only emails are those from your closed user group.

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Intracompany emails on private server

The Tunnel

Tunnel uses a closed email server to keep communications private. You can have confidence that you, your employees, vendors, and clients can communicate without worry. Use your channel to communicate within your closed user group.

Our Services

Tunnel offers a free month Trial
No Credit Card Required

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Request A Demo

Take a look at Tunnel's features. Get answers to your unique questions, and find out why Tunnel is the right choice for your business. Let us show you how the Tunnel's high-security platform works for all your intra and interoffice email needs.

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Schedule a live demo with one of tunnel's product specialists at your convenience

Contact Us

Have a question? Send us a message and we’ll get right back to you.


300 Delaware Ave, #210
Wilmington, DE 19801

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What People say?

From initial sign up to using the service was seamless. We simply fell in love with the private platform.

Matt Klein, Freenet, NYC

Tunnel saved us from our employees stealing data from regular emails. We feel secure on our internal communications.

Cindy S, HR - Illinois

As a CPA, we send tax returns to our clients with large attachments. Our clients love our private email server with Tunnel and the best part is, no size limit on the attachments. Recommend this service to any accounting firm. It's secure, cost effective and easy to use. No junk mails or spam.

Robert Wright, CPA, Sanfrancisco.