Private/Security/Test-ExchangeOnlineDomain.ps1
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function Test-ExchangeOnlineDomain { [CmdletBinding()] param ( [Parameter()] $DomainData ) $isOffice365Tenant = "No" $msoidRecord = $DomainData.MSOID | Where-Object { $_.NameHost -like '*clientconfig.microsoftonline*' } -ErrorAction SilentlyContinue if ($msoidRecord) { $isOffice365Tenant = 'Possibly' } $txtVerificationRecord = $DomainData.TXT | Where-Object { $_.Strings -like 'MS=ms*' } -ErrorAction SilentlyContinue if ($txtVerificationRecord) { $isOffice365Tenant = 'Possibly' } $mdmRecord = $DomainData.ENTERPRISEREGISTRATION | Where-Object { $_.NameHost -eq 'enterpriseregistration.windows.net ' } -ErrorAction SilentlyContinue if ($mdmRecord) { $isOffice365Tenant = 'Likely' } $autoDiscoverRecord = $DomainData.AUTODISCOVER | Where-Object { $_.NameHost -eq 'autodiscover.outlook.com' } -ErrorAction SilentlyContinue if ($autoDiscoverRecord) { $isOffice365Tenant = 'Yes' } $spfRecord = $DomainData.TXT | Where-Object { $_.Strings -like '*spf.protection.outlook.com*' } -ErrorAction SilentlyContinue if ($spfRecord) { $isOffice365Tenant = 'Yes' } $mxRecords = $DomainData.MX | Where-Object { ($_.NameExchange -like '*mail.protection.outlook.com*') -or ($_.NameExchange -like '*eo.outlook.com') } -ErrorAction SilentlyContinue if ($mxRecords) { $isOffice365Tenant = 'Yes' } $isOffice365Tenant } |