# CREDENTIALS
$userAdmin = "USER-ADMIN@DOMAIN"

# INSTALL
Install-Module -Name ExchangeOnlineManagement -Scope CurrentUser -Force -AllowClobber -AcceptLicense
Connect-ExchangeOnline -UserPrincipalName $userAdmin

# VARIABLES
$ruleName = "PhishX Exceptions"
$domainsException = @("appcentral.info","appstudio.shop","businessuniversity.tech","cloudacademy.live","cloudconnect.cfd","dealsnews.club","deviceguard.pro","digitaleducation.digital","festivalnews.online","infoportal.live","linkdata.live","mailvault.site","marketonline.one","microlearning.academy","peoplex.io","phishing.com.br","phishx.com","phishx.com.br","phishx.io","privacynow.click","proopportunity.one","securedevice.site","securetech.lat","securityapp.cloud","smartdevice.live","technews.rest","trainingportal.me","varejoonline.club","webportal.one")
$subjectPrepend = " "

# CHECK
try {
  $ruleExists = Get-TransportRule | Where-Object {$_.Name -eq $ruleName} -ErrorAction Stop
  $ruleFound = $true
}
catch {
  $ruleFound = $false
}

# SET
if ($ruleFound) {
  Write-Host "Rule '$ruleName' already exists. Editing the existing rule..." -ForegroundColor Yellow
  Set-TransportRule -Identity $ruleName -FromScope "NotInOrganization" -SenderDomainIs $domainsException -PrependSubject $subjectPrepend
} else {
  Write-Host "Rule '$ruleName' not found. Creating a new rule..." -ForegroundColor Green
  New-TransportRule -Name $ruleName -FromScope "NotInOrganization" -SenderDomainIs $domainsException -PrependSubject $subjectPrepend
}
Set-TransportRule -Identity $ruleName -Priority 0 -StopRuleProcessing $true
Enable-TransportRule -Identity $ruleName

# VERIFY
Get-TransportRule | Where-Object {$_.State -eq "Enabled"}
$url = "https://admin.exchange.microsoft.com/#/transportrules"
Write-Host "For further configuration, visit the Mail Flow Rules: ${url}"
Start-Process "${url}"