💼 Management Samenvatting
Schakel MailTips in om gebruikers te waarschuwen over externe ontvangers, grote audiences, en andere potentiële risks tijdens email compositie.
Aanbeveling
IMPLEMENT
Risico zonder
Low
Risk Score
4/10
Implementatie
1.5u (tech: 0.5u)
Van toepassing op:
✓ Exchange Online
✓ Outlook
✓ Outlook
MailTips provide realtime warnings VOORDAT email verzonden: (1) External recipient warnings - gebruiker ziet dat ontvanger BUITEN organisatie is (Gegevenslekage awareness), (2) Large audience tips - Waarschuwing bij email naar >25 ontvangers (accidental reply-all prevention), (3) Mailbox volledige - Ontvanger mailbox vol (email wordt niet delivered), (4) Out of office - Recipient is afwezig. Voor data loss prevention: External recipient MailTip is KEY awareness control - users denken twee keer na voordat confidential info naar external gaat.
PowerShell Modules Vereist
Primary API: Exchange Online
Connection:
Required Modules: ExchangeOnlineManagement
Connection:
Connect-ExchangeOnlineRequired Modules: ExchangeOnlineManagement
Implementatie
Set-OrganizationConfig -MailTipsAllTipsEnabled $true -MailTipsExternalRecipientsTipsEnabled $true. Users zien MailTips in Outlook tijdens email compositie.
- PowerShell: Set-OrganizationConfig -MailTipsAllTipsEnabled $true -MailTipsExternalRecipientsTipsEnabled $true
- User awareness: Communiceer dat MailTips helpen bij veilig emailen
Implementatie
Gebruik PowerShell-script mailtips-enabled.ps1 (functie Invoke-Remediation) – schakel in MailTips organisatiebreed.
- PowerShell: Set-OrganizationConfig -MailTipsAllTipsEnabled $true -MailTipsExternalRecipientsTipsEnabled $true
- User awareness: Communiceer dat MailTips helpen bij veilig emailen
Monitoring
Gebruik PowerShell-script mailtips-enabled.ps1 (functie Invoke-Monitoring) – Controleren.
- Verify: MailTipsAllTipsEnabled is True
- User feedback over MailTips helpfulness
Compliance en Auditing
- CIS M365 - Email security awareness
- User awareness controls
- Data loss prevention (awareness layer)
Remediatie
Gebruik PowerShell-script mailtips-enabled.ps1 (functie Invoke-Remediation) – Herstellen.
Compliance & Frameworks
- BIO: 09.02.01 - User access management
- ISO 27001:2022: A.9.2.1 - User access management
Automation
Gebruik het onderstaande PowerShell script om deze security control te monitoren en te implementeren. Het script bevat functies voor zowel monitoring (-Monitoring) als remediation (-Remediation).
PowerShell
<#
.SYNOPSIS
MailTips Enabled
.DESCRIPTION
Enables MailTips to warn users about external recipients, large audiences, etc.
.NOTES
NL Baseline v2.0
#>
#Requires -Version 5.1
#Requires -Modules ExchangeOnlineManagement
[CmdletBinding()]
param([switch]$Monitoring, [switch]$Remediation, [switch]$Revert,
[switch]$WhatIf)
$ErrorActionPreference = 'Stop'
Write-Host "`n========================================" -ForegroundColor Cyan
Write-Host "MailTips Enabled" -ForegroundColor Cyan
Write-Host "========================================`n" -ForegroundColor Cyan
function Invoke-Monitoring {
try {
Connect-ExchangeOnline -ShowBanner:$false -ErrorAction Stop
$orgConfig = Get-OrganizationConfig
$allTipsEnabled = $orgConfig.MailTipsAllTipsEnabled
$externalEnabled = $orgConfig.MailTipsExternalRecipientsTipsEnabled
Write-Host " All MailTips: $(if($allTipsEnabled){'ENABLED'}else{'DISABLED'})" -ForegroundColor $(
if ($allTipsEnabled) { 'Green' }else { 'Red' }
)
Write-Host " External Recipients Tips: $(if($externalEnabled){'ENABLED'}else{'DISABLED'})" -ForegroundColor $(
if ($externalEnabled) { 'Green' }else { 'Yellow' }
)
Write-Host "`n MailTips Features:" -ForegroundColor Cyan
Write-Host " • Warns about external recipients" -ForegroundColor Gray
Write-Host " • Large audience warnings" -ForegroundColor Gray
Write-Host " • Mailbox full notifications" -ForegroundColor Gray
Write-Host " • Automatic replies" -ForegroundColor Gray
if ($allTipsEnabled) {
Write-Host "`n[OK] COMPLIANT - Users get helpful warnings" -ForegroundColor Green
exit 0
}
else {
Write-Host "`n[FAIL] NON-COMPLIANT - MailTips disabled!" -ForegroundColor Red
exit 1
}
}
catch {
Write-Host "ERROR: $_" -ForegroundColor Red
exit 2
}
}
function Invoke-Remediation {
try {
Connect-ExchangeOnline -ShowBanner:$false -ErrorAction Stop
Set-OrganizationConfig -MailTipsAllTipsEnabled $true -MailTipsExternalRecipientsTipsEnabled $true -ErrorAction Stop
Write-Host "`n[OK] MailTips enabled" -ForegroundColor Green
Write-Host "Users will see warnings for external recipients and more" -ForegroundColor Cyan
exit 0
}
catch {
Write-Host "ERROR: $_" -ForegroundColor Red
exit 2
}
}
function Invoke-Revert {
try {
Connect-ExchangeOnline -ShowBanner:$false -ErrorAction Stop
Set-OrganizationConfig -MailTipsAllTipsEnabled $false -ErrorAction Stop
Write-Host " ⚠️ Disabled - no warnings for users" -ForegroundColor Yellow
exit 0
}
catch {
Write-Host "ERROR: $_" -ForegroundColor Red
exit 2
}
}
try {
if ($Revert) { Invoke-Revert }
elseif ($Monitoring) { Invoke-Monitoring }
elseif ($Remediation) { Invoke-Remediation }
else { Write-Host "Use: -Monitoring | -Remediation | -Revert" -ForegroundColor Yellow }
}
catch { throw }
finally {
Write-Host "`n========================================`n" -ForegroundColor Cyan
}
Risico zonder implementatie
Risico zonder implementatie
Low: Medium awareness risk - users niet gewaarschuwd over external recipients, accidental Gegevenslekage.
Management Samenvatting
Schakel in MailTips voor user awareness. Waarschuwt over external recipients, large audiences. gegevenslekken prevention layer. Implementatie: 30 min - 1 uur.
- Implementatietijd: 1.5 uur
- FTE required: 0.01 FTE