Safeguard Send for Microsoft 365

From: $2.00 / month with a 30-day free trial

Are you worried about your users carelessly sending emails to the wrong people? Is letting users respond to phishing emails or perhaps classified information spills a concern for you?  This Outlook add-in helps you avoid these mistakes and provides an external email warning whenever sending an email outside your company.


SKU: D73165 Category:


It’s a problem when you pick the wrong recipients by mistake, and then send the email.  And in the legal world, if you or a user accidently emails opposing legal counsel or other recipients it can be disastrous.  This can sometimes happen by having two names listed for one person, where one is a work email address and the other is a personal email address.  Then when composing the email and using the tab key to pick and choose recipients, the wrong “John Smith” is inadvertently chosen.  This mistake has happened many times, including as far back as 2014.

In fact, in a recent study by Tessian, misdirected emails are a much bigger problem than phishing, ransomware, and brute force attacks. In fact, in organizations with 1,000 employees, at least 800 emails are sent to the wrong person every year. That’s two a day.

Safeguard Send for Microsoft 365 helps to solve this and other issues when going to send emails by checking outgoing email, looking for incorrect recipients and other potential violations, for example examining email subjects, bodies and attachments, etc., to make sure they are in compliance with your business rules.  If not, then it provides an external email warning prompt.

While there are many outgoing email checks that can be performed, by far the most popular rule is an external email warning, that is, to prompt the user whenever sending an email outside the company.

In addition to scanning the recipients underlying email address (and not just the display name), there are a number of different conditions that can be checked as an email goes out the door.

For instance, you can…

  • …act on an email if sending an external email (i.e., outside the company (this is the most popular condition))
  • …act if the number of attachments is equal to or greater than N
  • …act if number of recipients is equal to or greater than N
  • …act if sending to 2 or more recipients in different external domains
  • …act if sending to specific recipients (e.g.,,, etc.)
  • …act if sending an email with PII (credit cards, SSNs, drivers license numbers, bank account numbers, etc.)
  • …act if the email subject, body, or attachment contains or does not contain your keywords
  • …act on every send

In addition, to call attention to the exact problem, the text of the warning prompt can be changed as well, or the email can be prevented from sending altogether.  The latter is useful to prevent sensitive keywords or credit card numbers from ever being sent (to comply with either corporate or national privacy policies (like HIPAA) or company security compliance policies).

The Safeguard Send for Microsoft 365 add-in comes with the ability to setup and monitor your rules for all your users through a centralized dashboard:

View of dashboard to control the rules over when to prompt when sending external emails.

Further, the Pro tier allows for complete white labeling so that your corporate logo can appear in the warning prompt, your corporate font and colors in the text of the prompts, and whatever other changes you need.  Here are several examples:

Three examples of company logos being used in the warning prompt.

And because it’s a modern Outlook add-in, installation is a breeze. No more replying on SCCM, login scripts, or visiting each desktop.  Instead, once you sign up, you simply install the add-in into your tenant, assign which users will be using it, and then send an email to see the warning prompt show up!  Here are the three steps to install:

Three steps to install: 1) create your subscription in AppSource, 2) Install the add-in using Microsoft Admin Center, and 3) Send an email and see the warning prompt appear.


Microsoft Azure Marketplace Logo

New!  This product is now listed on the Microsoft Azure Marketplace if you prefer to purchase through that method and it offers significant discounts thanks to Microsoft incentives that we can pass onto you.

Stop waiting for a preventable accident with a misdirected email and sign up for a trial today!


  • Prompts before sending to outside recipients
  • Warns users and gets their attention
  • Customizable prompts
  • Works on desktop Outlook for Windows, Outlook for Macs, and Office on the Web (note: not on any phones - yet!)
  • Also works with
  • No deployments!  Simply install it once into your tenant, it magically appears everywhere
New! You can now find us on Microsoft Azure Marketplace if you prefer to use Azure billing.

Videos and Screenshots

Click here to see the video on our YouTube channel!
Typical external email warning prompt This is a typical warning prompt that the end users will see.  Note how the external email address ( in this case) is highlighted in red to draw attention to any problem addresses.
Three examples of company logos being used in the warning prompt. A white labeling service (Pro tier only) allows the add-in to adopt your corporate look and feel regarding fonts and colors, and of course can feature your corporate logo.
View of dashboard to control the rules over when to prompt when sending external emails. Both tiers include access to a dashboard where you can create rules for your entire company all at once, along with overrides for individual users if you wish for more fine grained control.
Three steps to install: 1) create your subscription in AppSource, 2) Install the add-in using Microsoft Admin Center, and 3) Send an email and see the warning prompt appear. There are three steps to install: 1) Sign up for a free 30 day trial, 2) Install it into your tenant and assign users using Microsoft Admin Center and 3) Send an email to people outside your company and see the warning prompt!

Minimum Requirements

This add-in requires a subscription to Office 365 or an email account. If you use IMAP or POP3 (which is most Gmail users), this add-in will not work for you.  Instead, check out our line of desktop Outlook add-ins. This add-in works on these platforms:

Desktop Outlook
Outlook on the web
Image of Checkmark No Outlook for Android
Image of Checkmark No Outlook for iOS (including iPhone and iPad)

You can read more about the add-in, including how to install it into your email account, by reading our Getting Started with Safeguard Send for Office 365 guide.

If you're planning on taking a free 30 day trial or purchasing a subscription, then you can either sign up using our Microsoft Azure Marketplace listing or have your Safeguard Send rules customized for your company by filling out this questionnaire. Note that either method will allow you access to the Safeguard Send dashboard that allows you control your own rules.

Note that while tech support is limited for free products, this guide to Getting Help For Office 365 Apps is useful if you're having trouble.

You can also read our Terms and Conditions for all our Office 365 apps and our Privacy Policy. In short, you should know that we send information to our cloud servers so that we can determine which features are useful and which no one is using. We also use it to help identify widespread problems and in the event you need help from us. Finally, we use your email address to allow continued access to the app.

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