Apps & Downloads

RMail for Outlook Online,,, and Office 365 for Mac

Track email opens, prove email delivery, encrypt private email, and get documents signed electronically — all from within Microsoft Outlook Online,, Office 365 for Mac, or 

This RMail add-in provides seamless access to  RMail services when using Outlook Online,, or, allowing you to track email opens, get automatic proof of email delivery, encrypt private email, get documents signed electronically, and convert PDF files.

RMail is powered by RPost’s Registered Email™ technology, the global standard for email delivery proof.

Click the button below to go to the official app page in the Office Store. You will need to follow the instructions on that page to add the app to your webmail interface.
Get Started


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how to

New Installation:

  1. Make sure you are logged into your Outlook Online/ account before proceeding.
  2. Click the Get Started button above, to be directed to the RMail for Outlook Online listing, on Microsoft’s Office Store.
  3. Click the “Add” button on the RMail listing. You may be prompted for your email address. Please enter only the email address you are using with Outlook Online,, or A dialog window will open, asking you to confirm the installation. Click Install. Click OK
  4. Return to your inbox. Click New to compose a new email.
  5. When the compose window opens, click Add-ins (directly above “To” field). When the Add-ins window slides open, choose RMail and begin using the Add-in. If you do not see Add-ins, look for the red circle “R” icon near the bottom of the compose window. Click this to open the RMail sending options.