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Microsoft automatically blocks images on all external emails and there is no admin level configuration that ensures images are automatically shown to end-users unless it’s on their personal safe list. User could manually add the domains to their own safe list but that is cumbersome and not something we’d expect a user to perform.

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To optionally add all domains to all of your users allow list you can run the following script using the Exchange Online V3 PowerShell modules.

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Code Block

breakoutMode	wide
language	powershell

<#
YOU MUST CONNECT to Exchange Online as a Global Admin for this script to run properly. 
Connect-ExchangeOnline
#>

$domains = @(
    "ssuport.com",
    "supppot.com",
    "center-supports.com",
    "supoorts.com",
    "suporrt.com",
    "team-support.net",
    "supppot.net",
    "legal-user.com",
    "the-verification.com",
    "legals-team.com",
    "authenticatecenter.com",
    "ourlogin.co.uk",
    "mnminfo.com",
    "help-desc.com",
    "account-protector.com",
    "calendarsupdates.com",
    "appstatusupdate.com",
    "hr-updates.net",
    "itservicesector.com",
    "mailer-sender.com",
    "servicealerts.net",
    "status-pager.com",
    "nonreplies.com",
    "registerconfirmation.com",
    "altasian.net",
    "communitlyforums.com",
    "validation-service.net",
    "supplyservice.net",
    "shopping-card.net",
    "paymentserrvice.com",
    "online-store-service.com",
    "market-sales.net",
    "internal-service-updates.com",
    "infraupdates.com"
)

# Prompt user to choose between adding or removing domains

$addDomains = ""
while ($addDomains -ne "a" -and $addDomains -ne "r") {
    $addDomains = Read-Host "Do you want to add (a) or remove (r) domains? (Aa/Rr)"
    $addDomains = $addDomains.Trim().ToLower()  # Trim whitespace and convert to lowercase
}

function Write-ProgressHelper {
    param (
        [int]$StepNumber,
        [string]$Message
    )

    Write-Progress -Activity 'Updating SafeList' -Status $Message -PercentComplete (($StepNumber / $steps) * 100)
}
$script:steps = ([System.Management.Automation.PsParser]::Tokenize((Get-Content "$PSScriptRoot\$($MyInvocation.MyCommand.Name)"), [ref]$null) | Where-Object { $_.Type -eq 'Command' -and $_.Content -eq 'Write-ProgressHelper' }).Count

$stepCounter = 0

# Get all active user type mailboxes
Write-ProgressHelper -Message 'Getting mailboxes' -StepNumber ($stepCounter++)
$Mailboxes = Get-Mailbox -RecipientTypeDetails UserMailbox -ResultSize Unlimited
$totalMailboxes = $Mailboxes.Count
Write-Output "Total mailboxes: $totalMailboxes"
$processedMailboxes = 0

# Configure junk email settings for each mailbox
if ($addDomains -eq "A" -or $addDomains -eq "a") {
    $JunkEmailConfig = @{
        Add = "ssuport.com", "supppot.com", "center-supports.com", "supoorts.com", "suporrt.com", "team-support.net", "supppot.net", "legal-user.com", "the-verification.com", "legals-team.com", "authenticatecenter.com", "ourlogin.co.uk", "mnminfo.com", "help-desc.com"
    $domains
    }
} else {
    $JunkEmailConfig = @{
        Remove = "ssuport.com", "supppot.com", "center-supports.com", "supoorts.com", "suporrt.com", "team-support.net", "supppot.net", "legal-user.com", "the-verification.com", "legals-team.com", "authenticatecenter.com", "ourlogin.co.uk", "mnminfo.com", "help-desc.com"
    }
}$domains
    }
}


# Configure junk email settings for each mailbox
Write-ProgressHelper -Message 'Configuring junk email settings' -StepNumber ($stepCounter++)
$i = 0
foreach ($Mailbox in $Mailboxes) {
    $MailboxIdentity = $Mailbox.PrimarySmtpAddress.ToString()
    Set-MailboxJunkEmailConfiguration -Identity $MailboxIdentity -TrustedSendersAndDomains $JunkEmailConfig
    $processedMailboxes++
    if ($addDomains -eq "A" -or $addDomains -eq "a") {

        Write-Progress -Id 1 -Activity "Working..." -status "Added: $i of $($Mailboxes.Count)" -percentComplete (($i / $Mailboxes.Count) * 100)
        $i++
    }
    else {
        Write-Progress -Id 1 -Activity "Working..." -status "Removed: $i of $($Mailboxes.Count)" -percentComplete (($i / $Mailboxes.Count) * 100)
        $i++
    }
}
Write-Output "Processed mailboxes: $processedMailboxes"

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