How to prevent Outlook to block images download in PhishBrain messages

Outlook may prevent automatic download of images inside PhishBrain messages because sending domain aren't included in Trusted / Safe Senders List.

To allow download from PB sending domains for your users there are two ways:

Using Global Policy

1. Add PB sending domains on Outlook client and export it to a .txt file and save the .txt file to a file share that is accessible by all clients

   

2. In the GPO go to User Configuration>Policies>Administrative Templates>Microsoft Office Outlook > Options > Preferences > Junk Email > Specify path to Safe Senders list

   

3. Set this policy to enabled and specify that path to the .txt file you saved in the step 1.

   

4. Now you need via the Windows registry to tell Outlook to actually go import the file. Create a register key in Computer\HKEY_CURRENT_USER\Software\Policies\Microsoft\office\<version>\outlook\options\mail 
   • Value Name: JunkMailImportLists
   • Value Type: REG_DWORD
   • Value Data:1
   • Base: Decimal

Using PowerShell

Add to a specific mailbox

1. Get mailbox name

   • >Get-Mailbox -ResultSize Unlimited

     

2. Add trusted domains for each mailbox
   • >Set-MailboxJunkEmailConfiguration "april.o'neil" -TrustedSendersAndDomains @{Add="microsft.org","awazon.com"}
3. Check updated configuration

   • >Get-MailboxJunkEmailConfiguration "april.o'neil"

     

Bulk add to multiple mailboxes

To apply setting to multiple mailboxes (or a subset with -Filter param) you can combine Get-mailbox command output and Set-MailboxJunkEmailConfiguration >Get-Mailbox -ResultSize Unlimited -Filter "name -eq 'pparker'" | Set-MailboxJunkEmailConfiguration -TrustedSendersAndDomains @{Add="microsft.org","awazon.com"}