The Voltage SecureMail app allows you to read and send encrypted email on supported iPhones and iPads running iOS 9.0 or later.

IMPORTANT: Anyone who has received Voltage encrypted email can use this application to read it. However, replying to messages and composing new secure emails requires the features to be enabled by the sending organization. Voltage SecureMail users, for whom the mobile policy is not enabled, are redirected to the embedded browser, aka Zero Download Messenger (ZDM), to read and send secure messages.

Key Features*:

• Read encrypted email and attachments, online or offline
• Attach photos to secure email and send
• Attach any format file from iCloud, OneDrive, Google Drive, and DropBox etc.
• Print secure messages (requires activation by the sender)
• Send secure email with one tap of a “Send Secure” button
• Send and receive secure email to and from anyone with a standard email inbox
• Works with the native iOS email application and your existing inboxes
• Access to local Contacts and Exchange Global Address List
• Tailor-made user experience for iPhones and iPads
• Simple self-registration and authentication
• Works with popular cloud and web-based email systems
• Biometric (TouchID or FaceID) authentication supported

How to Read and Reply to Secure Messages:

• Install this mobile app on your iPhone or iPad
• Return to your inbox and tap the secure message
• Press and hold (do not tap) the “message_zdm.html” attachment
• Select the Voltage Mail app from the list and follow the instructions
• To reply to a message, tap the reply icon

Send Messages:

• Open the Voltage SecureMail app
• Tap the Compose icon

Supported OS Versions:

• Requires an iPhone or iPad with iOS 9 or later

* Features including printing, attachments, reply, and compose are controlled by the sending organization’s mobile policy

What’s New

Version 3.3

- Support for Siri Shortcuts, 'Send Secure' available for iOS 12.x above
- Support for spotlight search enabled for Voltage Mail
- Improved help files and navigation
- Bug fixes and performance improvements

Ratings and Reviews

1.7 out of 5
358 Ratings

358 Ratings

ThanksForKeepingThisAppFree! ,

Mobile workaround if you don't like the app

Thanks to the other reviews I've been able to get the app to work but if you don't like it you can actually use the Desktop instructions as well. Just forward the email to the address they list in their instructions and it will send you an email with a link. Click the link and it will open in Safari for you to login and view the encrypted email. You will remain logged in for a limited amount of time so you can do a few emails at once without having to login each time. The links they send do expire though, seems to be good for about 24 hours? I haven't timed it. It's been a decent workaround for me till today when I found the other reviews that explain the app. (Thanks everyone!)

Either way though, I hope Voltage will make their process a little more user friendly. Security is good, but convenience is too.

Bfdm_mexi ,

Waste of time

This is a horrible app. Once you sign in and try to download your document all you get to do it view it in the program. It doesn't download and there is no back button. So you have to close it, go back to the email, press and hold the attachment, select open in voltage, re enter your password, then enter another verification, and you finally get to select view or download document. But the joke is on you, both selections do the same thing and you cannot actually download and print anything. And with no back button, you end up wasting a lot of time

KareMM ,

Works perfectly

I have a secure message account set up with Wells Fargo already and needed to read a secure email on my phone. Downloaded the app, followed the instructions to press and hold the attachment and then chose “open in Voltage Mail”. I typed in my existing password, the message opened right up, and I read it and responded. I also had the option to print. No problem whatsoever.


Voltage Security
50.9 MB

Requires iOS 9.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating
Rated 4+
© Voltage Security, Inc.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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