Category: Messaging


There is no way by default; only after O365 groups creation using this powershell script:

$UserCredential = Get-Credential

$Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://outlook.office365.com/powershell-liveid/ -Credential $UserCredential -Authentication Basic -AllowRedirection

Import-PSSession $Session

#Get all Office 365 Groups that have have the Welcome Message enabled

$O365Groups = Get-UnifiedGroup | Where-Object{$_.WelcomeMessageEnabled -eq $true}

#Iterate through the Groups, disabling the Welcome Message

foreach ($group in $O365Groups) {

Write-Host “Disabling Welcome Message on O365 Group: ” -NoNewline;

Write-Host $group.DisplayName -ForegroundColor Cyan

Set-UnifiedGroup $group.Identity -UnifiedGroupWelcomeMessageEnabled:$false

}

#Close the Session

Remove-PSSession $Session

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Web resources:

https://practical365.com/exchange-server/hybrid-exchange-office-365/

 

About Office 365 message encryption:

New Office 365 Message Encryption capabilities built on top of Azure Information Protection, your organization can use protected email communication with people inside and outside your organization. The new OME capabilities work with other Office 365 organizations, Outlook.com, Gmail, and other email services

OME How to:

https://support.office.com/en-us/article/office-365-message-encryption-ome-f87cb016-7876-4317-ae3c-9169b311ff8a

 

https://blogs.technet.microsoft.com/undocumentedfeatures/2017/11/17/detecting-outlook-exchange-data-exfiltration/