Defining safe sender in Microsoft Outlook

Safe senders are email senders that can avoid spam folder and can request Outlook to download the additional images automatically without employee manual intervention, this is crucial for the phishing test measure, please follow this instruction to set webitwo.com as safe sender domain in your company.

Prerequisites

You are the administrator in your network and you allow webitwo.com through any centralized spam filtering systems.

Creating safe sender list

Create a safe_sender.txt file that stores a list of safe senders and add webitwo.com, if you already created this file in the past, then append webitwo.com to new line, save the safe_sender.txt file to a file share that is accessible by all clients, for example \\Shared\Netlogon.

Administrative Template

Download the appropriate version from Mocrosoft Download Center which will allow you to customize the group policy object.

• Use this link for Office 2010
• Use this link for Office 2013
• Use this link for Office 2016, 2019 or 365

Group Policy

In Administrative Template, create a new GPO for customizing Outlook or Office, go to User Configuration > Policies > Administrative Templates > Microsoft Office Outlook XXXX > Options > Preferences > Junk Email, Open Specify path to Safe Senders list, set this policy to enabled and specify that path to the safe_sender.txt file you saved on the shared folder.

Enable safe sender import to client Outlook

In the same GPO navigate to User Configuration > Preferences > Windows Settings > Registry, right Click Registry and select New Registry Item, set the following properties:

Action: Update
Hive: HKEY_CURRENT_USER
Key Path:Software\Policies\Microsoft\Office\14.0\Outlook\Options\Mail (For Office 2010)
Key Path:Software\Policies\Microsoft\Office\15.0\Outlook\Options\Mail (For Office 2013)
Key Path:Software\Policies\Microsoft\Office\16.0\Outlook\Options\Mail (For Office 2016, 2019 or 365)
Value Name: JunkMailImportLists
Value Type: REG_DWORD
Value Data:1
Base: Decimal

Apply the group policy, and the next time GP is updated on the client and Outlook is restarted, the safe sender list will be imported.