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112 lines
5.0 KiB
PowerShell
112 lines
5.0 KiB
PowerShell
#Create mail flow rule for adding External warning message for external mails
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Param
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(
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[Parameter(Mandatory = $false)]
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[switch]$MFA,
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[string]$ExcludeGroupMembers,
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[string]$ExcludeMB,
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[string]$UserName,
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[string]$Password
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)
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Get-PSSession | Remove-PSSession
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#Authentication using MFA
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if($MFA.IsPresent)
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{
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$MFAExchangeModule = ((Get-ChildItem -Path $($env:LOCALAPPDATA+"\Apps\2.0\") -Filter CreateExoPSSession.ps1 -Recurse ).FullName | Select-Object -Last 1)
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If ($MFAExchangeModule -eq $null)
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{
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Write-Host `nPlease install Exchange Online MFA Module. -ForegroundColor yellow
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Write-Host You can manually install module using below blog : `nhttps://o365reports.com/2019/04/17/connect-exchange-online-using-mfa/ `nOR you can install module directly by entering "Y"`n
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$Confirm= Read-Host `nAre you sure you want to install module directly? [Y] Yes [N] No
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if($Confirm -match "[Y]")
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{
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Start-Process "iexplore.exe" "https://cmdletpswmodule.blob.core.windows.net/exopsmodule/Microsoft.Online.CSE.PSModule.Client.application"
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}
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else
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{
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Start-Process 'https://o365reports.com/2019/04/17/connect-exchange-online-using-mfa/'
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Exit
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}
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$Confirmation= Read-Host Have you installed Exchange Online MFA Module? [Y] Yes [N] No
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if($Confirmation -match "[yY]")
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{
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$MFAExchangeModule = ((Get-ChildItem -Path $($env:LOCALAPPDATA+"\Apps\2.0\") -Filter CreateExoPSSession.ps1 -Recurse ).FullName | Select-Object -Last 1)
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If ($MFAExchangeModule -eq $null)
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{
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Write-Host Exchange Online MFA module is not available -ForegroundColor red
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Exit
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}
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}
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else
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{
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Write-Host Exchange Online PowerShell Module is required
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Start-Process 'https://o365reports.com/2019/04/17/connect-exchange-online-using-mfa/'
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Exit
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}
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}
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#Importing Exchange MFA Module
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. "$MFAExchangeModule"
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Write-Host Enter credential in prompt to connect to Exchange Online
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Connect-EXOPSSession -WarningAction SilentlyContinue
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}
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#Authentication using non-MFA
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else
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{
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#Storing credential in script for scheduling purpose/ Passing credential as parameter
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if(($UserName -ne "") -and ($Password -ne ""))
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{
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$SecuredPassword = ConvertTo-SecureString -AsPlainText $Password -Force
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$Credential = New-Object System.Management.Automation.PSCredential $UserName,$SecuredPassword
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}
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else
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{
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$Credential=Get-Credential -Credential $null
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}
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$Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://outlook.office365.com/powershell-liveid/ -Credential $Credential -Authentication Basic -AllowRedirection -WarningAction SilentlyContinue
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Import-PSSession $Session -AllowClobber -DisableNameChecking | Out-Null
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}
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$Disclaimer='<p><div style="background-color:#FFEB9C; width:100%; border-style: solid; border-color:#9C6500; border-width:1pt; padding:2pt; font-size:10pt; line-height:12pt; font-family:Calibri; color:Black; text-align: left;"><span style="color:#9C6500"; font-weight:bold;>CAUTION:</span> This email originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe.</div><br></p>'
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$ExcludeGroups=@()
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$ExcludeMBs=@()
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#Check for exclude groups
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if([string]$ExcludeGroupMembers -ne "")
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{
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$Groups= $ExcludeGroupMembers -Split ","
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#Check whether the grup exists
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foreach($Group in $Groups)
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{
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$check=Get-DistributionGroup -Identity $Group -ErrorAction SilentlyContinue
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if($check -eq $null)
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{
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$check=Get-UnifiedGroup -Identity $Group -ErrorAction silentlycontinue
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if($check -eq $null)
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{
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Write-Host $Group not exist in the tenant -ForegroundColor Red
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continue
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}
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}
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$ExcludeGroups +=$Group
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}
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Write-Host `nCreating mail flow rule for External Senders... -ForegroundColor Yellow
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New-TransportRule "External Email Warning" -FromScope NotInOrganization -SentToScope InOrganization -PrependSubject [EXTERNAL]: -Priority 0 -ApplyHtmlDisclaimerText $Disclaimer -ExceptIfSentToMemberOf $ExcludeGroups -ApplyHtmlDisclaimerLocation Prepend -ApplyHtmlDisclaimerFallbackAction Wrap
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}
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#Create Transport rule with exclude mailbox that in To and CC
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elseif($ExcludeMB -ne "")
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{
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$MBs= $ExcludeMB -Split ","
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#Check whether the grup exists
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foreach($MB in $MBs)
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{
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$ExcludeMBs +=$MB
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}
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Write-Host `nCreating mail flow rule for External Senders... -ForegroundColor Yellow
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New-TransportRule "External Email Warning" -FromScope NotInOrganization -SentToScope InOrganization -PrependSubject [EXTERNAL]: -Priority 0 -ApplyHtmlDisclaimerText $Disclaimer -ExceptIfAnyOfToCCHeader $ExcludeMBs -ApplyHtmlDisclaimerLocation Prepend -ApplyHtmlDisclaimerFallbackAction Wrap
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}
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else
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{
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Write-Host Creating mail flow rule for External Senders... -ForegroundColor Yellow
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New-TransportRule "External Email Warning" -FromScope NotInOrganization -SentToScope InOrganization -PrependSubject [EXTERNAL]: -Priority 0 -ApplyHtmlDisclaimerText $Disclaimer -ApplyHtmlDisclaimerLocation Prepend -ApplyHtmlDisclaimerFallbackAction Wrap
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} |