RPostOne for Outlook

RPostOne for Outlook

RPostOne for Outlook provides a single-click gateway to a suite of powerful RPost services seamlessly integrated within Microsoft Outlook. Gain instant access to RMail E-Security and E-Compliance, RSign eSignatures, and RDocs Secure Content Sharing effortlessly, streamlining your email and document management experience.

Installing the RPostOne for Outlook app adds a “Send Registered™” button to the mail compose window in Microsoft Outlook (versions 2010 or newer, or Office 365 Outlook) This add-in also works with Office 365 (if you install Microsoft Outlook onto your computer). The button will appear above or next to the traditional “Send” button and allows the user to send RMail messages. RPostOne for Outlook software includes the following sending options: email open tracking, proof of email delivery, encryption, electronic signature & contracting, large file transfer, PDF conversion, controlled document security & content sharing, authentication, preemptively detect in-progress BEC attacks, metadata cleaning, and more.

Installing the RPostOne for Outlook app also enables advanced AI to automate the decision on what to send encrypted, or which emails need to be certified and tracked; and then does it. The AI runs in the background when you click the traditional “Send” or “Reply” buttons.

Main Services:

Privacy & Compliance:

  • Track & Prove: Sends a Registered Email™ message. A Registered Receipt™ email record is then returned to the sender with court-admissible, time-stamped proof of the content delivered and advanced open tracking.
  • Dynamic Encryption: Far beyond opportunistic TLS, RMail intelligently delivers email messages and attachments encrypted to the recipient’s inbox with no need for the recipient to register, click links or install any software. The sender is then returned a Registered Encryption™ receipt for auditable proof-of-fact of encryption and compliance with data privacy laws and regulations.
  • Secure Large File Share: Senders can easily attach and track up to 1GB of files from Outlook or the RMail Web app. Senders can send large files securely to any recipient with encryption and configurable self-purging options (from 1 to 90 days) in a one-time online storage box that eliminates the risk of download recipients being able to see sender's cloud storage file structure.
  • ViewProof™: Senders can tag content in a message template or in any email such that the sender receives court-admissible proof that the recipient has viewed selected tagged parts of an email.*


  • Active Tracker™: actively monitors outbound email activity by IP, providing valuable information on who is reading emails, where they are being read from, on what devices, and more. If hazardous activity is detected, RMail instantly delivers an Email Eavesdropping™ alert to admins and/or senders, depending on your specific configuration.*
  • Right Recipient™ mis-addressing and email impostor human error prevention: AI infused service that, in the moment of sending, and if a message is detected to contain sensitive content, automatically reviews the recipient addresses before transmission, determines if the sender should be prompted to verify whether they really want to send sensitive information to the particular recipients, alerts the sender if they are sending to what could be a fake domain or newly created domain used by an impostor, and then if approved for sending, applies the appropriate level of encryption to the message enroute.
  • RMail Recommends™: AI-infused, data loss prevention service that sensitizes users of their need to treat certain messages differently, based on the content of the message. RMail Recommends™ not only protects your organization's data, but also trains users in the moment of sending. 
  • Anti-Whaling™ email impostor protection: Anti-Whaling technology prevents targeted ‘spear-phishing’ and Business Email Compromise (BEC) attacks and alerts the recipient at the moment of reading or attempting to reply or forward.
  • Redact Reply™: Senders can tag content in a message template or in any email, with the tagged content redacted from reply emails if the recipient replies. This automatically removes potentially sensitive text from the reply email thread, protecting the sender from having sensitive content remaining in back-and-forth email threads. The redacted content remains part of the sender’s sent item and Registered Receipt™ email proof record.*
  • Redact Bcc™: Senders can redact addresses in the To/Cc/Bcc fields, such that recipients in Bcc do not mistakenly reply to all, exposing that they were blind copied.*
  • Digital Seal®: Specialized service that allows to create authenticatable and visually timestamped pdf attachments (e.g., invoices), reducing the risk of recipients being tricked by impostor emails.
  • Disappearing Ink™: senders can tag certain parts of an email message to disappear from within the email after delivery after a designated amount of time since sending, based on number of views, or time per view. There is no record of the content tagged as Disappearing Ink™ in the sender’s sent mailbox or Registered Receipt™ record; and after the content is scheduled to disappear, it additionally disappears from within the recipient inbox message content with no trace.


  • eSignatures: Attach a document, add addresses and a message, and click “Send to RSign” and your message and attachments open in the RSign full featured e-sign interface ready to configure and send. Or, simply attach and send (no further configuration needed) as a Registered Email message that auto-formats so the recipient can electronically sign. Both services (RMail eSignatures and RSign eSignatures) automatically return a legally signed contract to both sender and recipient.
  • RDocs™: Instantly converts any file into an RPD™ (Rights Protected Document) file format, allowing senders to share documents securely, control who can access a document, when, where, how many times, and for how long; monitor activities remotely, obtaining detailed information about who reads what, where, when and how many times; revoke access or kill content after sending & modify file settings or access restrictions after the send.*
  • SideNote®: Senders can append a private “sticky note” to a copied or blind copied recipient to provide context as to why they were copied. When used in combination with Disappearing Ink™, that note can be set to disappear from the recipient inbox after read.

*Some features may require to be enabled via Professional Services. 

IMPORTANT NOTE: Please select the bit version of your Microsoft Outlook (32-bit or 64-bit). The RPostOne for Outlook works on both 32-bit and 64-bit Windows so Windows bit version is not relevant.

Please follow the steps below to determine the Outlook bit version:

1. Outlook 2013 or newer: File > Office Account > About Outlook (listed at the end of the first line on the pop-up)
2. Outlook 2010: File > Help (listed on the first line below, “About Outlook”)


The RPostOne for Outlook is designed to send from your default mail account in Account Settings.

Product Tour

How to Install

New Installation:

  1. Confirm if your Microsoft Outlook is 32-bit or 64-bit
    1. Open Outlook
    2. Outlook 2013 or newer: File > Office Account > About Outlook (listed at the end of the first line on the pop-up)
    3. Outlook 2010: File > Help (listed on the first line below, “About Outlook”)
  2. Close Microsoft Outlook
  3. Click the appropriate download button above and follow the installation wizard.

Installation Support Center

RMail FAQs

Getting Started


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App Info

Languages Supported:

English (version 12.0.3)

International Languages (version 12.0.3):

Danish, Dutch, English, French, German, Italian, Latvian, Lithuanian, Polish, Portuguese, Spanish.

Minimum Requirements:

Operating System Windows
Windows version 7 (32/64 bit), 8 (32/64 bit), 10 (32/64 bit), 11 (32/64 bit)
Office Version 2010, 2013, 2016, 2019, Office 365 full install (32/64-bit)
Function model Outlook client runs locally or through terminal services
Program size 5MB
Program type Outlook COM Add-In using IDTExtensibility for a shared Add-In. Shimmed to provide an isolated, unique AppDomain.
.NET Framework 4.0 or greater.
Install package Windows Installer MSI. Installs using Visual Studio Installer technology for Windows Installer.
Additional applications needed to run or start-up None
Specific application conflicts None
Uninstall Control Panel, Programs (clean uninstall)
Deployment Single user, user group or company-wide deployment
Updates Manual upgrades only
Folder Location For (32-bit) - C:\Program Files (x86)\RMail
For (64-bit) - C:\Program Files\RMail
Requirements Valid inbound and outbound email account.
Administrative rights required for installation only.
Recommended email format HTML or plain text (Rich Text not recommended)
Licensing Per user, shared group of users, or usage-based
Feature customization Outlook ‘Options’ panel or Configuration file (XML)
“Send Registered” Button location Above the native Outlook “Send” button.