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Add External Email Warning

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Add External Email Warning
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AdminDroid 2023-08-11 13:52:51 +05:30
parent 895b612700
commit 267fe120cf
1 changed files with 46 additions and 53 deletions
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85
External Warning Rule for External Emails/ExternalWarningRule.ps1
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@ -1,72 +1,62 @@
#Create mail flow rule for adding External warning message for external mails
<#
=============================================================================================
Name: Configure External Email Warning Message for External Office 365 Emails
Version: 3.0
Website: o365reports.com
Script Highlights:
~~~~~~~~~~~~~~~~~~
1.This script can be executed with MFA enabled account too.
2.Prepends “External” to subject line for incoming external emails
3.Adds “External Disclaimer” for external emails
4.You can exclude group mailboxes like support, sales that facing external world.
For detailed script execution: https://o365reports.com/2020/03/25/how-to-add-external-email-warning-message/
============================================================================================
#>
#Create mail flow rule for adding External warning message for external mails
Param
(
[Parameter(Mandatory = $false)]
[switch]$MFA,
[string]$ExcludeGroupMembers,
[string]$ExcludeMB,
[string]$UserName,
[string]$Password
)
Get-PSSession | Remove-PSSession
#Authentication using MFA
if($MFA.IsPresent)
{
$MFAExchangeModule = ((Get-ChildItem -Path $($env:LOCALAPPDATA+"\Apps\2.0\") -Filter CreateExoPSSession.ps1 -Recurse ).FullName | Select-Object -Last 1)
If ($MFAExchangeModule -eq $null)
#Check for EXO module inatallation
$Module = Get-Module ExchangeOnlineManagement -ListAvailable
if($Module.count -eq 0)
{
Write-Host `nPlease install Exchange Online MFA Module. -ForegroundColor yellow
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
$Confirm= Read-Host `nAre you sure you want to install module directly? [Y] Yes [N] No
if($Confirm -match "[Y]")
Write-Host Exchange Online PowerShell module is not available -ForegroundColor yellow
$Confirm= Read-Host Are you sure you want to install module? [Y] Yes [N] No
if($Confirm -match "[yY]")
{
Start-Process "iexplore.exe" "https://cmdletpswmodule.blob.core.windows.net/exopsmodule/Microsoft.Online.CSE.PSModule.Client.application"
Write-host "Installing Exchange Online PowerShell module"
Install-Module ExchangeOnlineManagement -Repository PSGallery -AllowClobber -Force
Import-Module ExchangeOnlineManagement
}
else
{
Start-Process 'https://o365reports.com/2019/04/17/connect-exchange-online-using-mfa/'
Exit
}
$Confirmation= Read-Host Have you installed Exchange Online MFA Module? [Y] Yes [N] No
if($Confirmation -match "[yY]")
{
$MFAExchangeModule = ((Get-ChildItem -Path $($env:LOCALAPPDATA+"\Apps\2.0\") -Filter CreateExoPSSession.ps1 -Recurse ).FullName | Select-Object -Last 1)
If ($MFAExchangeModule -eq $null)
{
Write-Host Exchange Online MFA module is not available -ForegroundColor red
Write-Host EXO module is required to connect Exchange Online.Please install module using Install-Module ExchangeOnlineManagement cmdlet.
Exit
}
}
else
{
Write-Host Exchange Online PowerShell Module is required
Start-Process 'https://o365reports.com/2019/04/17/connect-exchange-online-using-mfa/'
Exit
}
}
#Importing Exchange MFA Module
. "$MFAExchangeModule"
Write-Host Enter credential in prompt to connect to Exchange Online
Connect-EXOPSSession -WarningAction SilentlyContinue
}
#Authentication using non-MFA
else
{
#Storing credential in script for scheduling purpose/ Passing credential as parameter
Write-Host Connecting to Exchange Online...
#Storing credential in script for scheduling purpose/ Passing credential as parameter - Authentication using non-MFA account
if(($UserName -ne "") -and ($Password -ne ""))
{
$SecuredPassword = ConvertTo-SecureString -AsPlainText $Password -Force
$Credential = New-Object System.Management.Automation.PSCredential $UserName,$SecuredPassword
Connect-ExchangeOnline -Credential $Credential
}
else
{
$Credential=Get-Credential -Credential $null
Connect-ExchangeOnline
}
$Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://outlook.office365.com/powershell-liveid/ -Credential $Credential -Authentication Basic -AllowRedirection -WarningAction SilentlyContinue
Import-PSSession $Session -AllowClobber -DisableNameChecking | Out-Null
}
$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>'
$ExcludeGroups=@()
$ExcludeMBs=@()
@ -104,9 +94,12 @@ elseif($ExcludeMB -ne "")
}
Write-Host `nCreating mail flow rule for External Senders... -ForegroundColor Yellow
New-TransportRule "External Email Warning" -FromScope NotInOrganization -SentToScope InOrganization -PrependSubject [EXTERNAL]: -Priority 0 -ApplyHtmlDisclaimerText $Disclaimer -ExceptIfAnyOfToCCHeader $ExcludeMBs -ApplyHtmlDisclaimerLocation Prepend -ApplyHtmlDisclaimerFallbackAction Wrap
}
}
else
{
Write-Host Creating mail flow rule for External Senders... -ForegroundColor Yellow
New-TransportRule "External Email Warning" -FromScope NotInOrganization -SentToScope InOrganization -PrependSubject [EXTERNAL]: -Priority 0 -ApplyHtmlDisclaimerText $Disclaimer -ApplyHtmlDisclaimerLocation Prepend -ApplyHtmlDisclaimerFallbackAction Wrap
}
Write-Host `n~~ Script prepared by AdminDroid Community ~~`n -ForegroundColor Green
Write-Host "~~ Check out " -NoNewline -ForegroundColor Green; Write-Host "admindroid.com" -ForegroundColor Yellow -NoNewline; Write-Host " to get access to 1800+ Microsoft 365 reports. ~~" -ForegroundColor Green `n`n
Disconnect-ExchangeOnline