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How to Disabled OWA Signatures in Office 365 for all Staff.

This is normally done if a 3rd Party email branding software like exclaimer or CodeTwo is being used.

Native to Office 365 (Exchange Online) there is a great way to prevent users from Enabling Signatures in OWA : Disable OWA Signatures.

First lets create a connection to Office 365 Powershell.

$UserCredential = Get-Credential

Next lets create a new PSSession

$Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri -Credential $UserCredential -Authentication Basic -AllowRedirection

After Creating the new PSSession lets import it

Import-PSSession $Session

The shell will look as follow after the import

Now that we have a connection to #MSOffice365 , lets go ahead and run a script to view all Users with OWA email signatures.

Get-Mailbox -ResultSize Unlimited | Get-MailboxMessageConfiguration | Where-Object {$_.AutoAddSignature -Match “True”} | Select-Object AutoAddSignature,MailboxOwnerId

Results after running the fist script

Results of Users with OWA enabled signatures will display. We can now run the second script to remove all “AutoAddSignature” for all Mailbox’s

Get-Mailbox -ResultSize Unlimited | Set-MailboxMessageConfiguration -AutoAddSignature $false| Select-Object Name,AutoAddSignature


Hope you enjoyed the read !

Twitter: shaun.hardneck


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