Office 365 - can I change default Junk Email behaviour for all users?

Hi all,

We recently configured hybrid exchange and I am currently testing O365 with a few users.

I would like to change the Junk Email folder settings for all our of our users.  Is this possible?

This is the setting in Settings >> Mail >> Accounts >> Block or Allow

O365 junk email settings

I would like the default to be "Dont move email to my Junk Email folder".  It seems for the majority of users the default is "Automatically filter junk email".

I cannot seem to find anywhere in any of the admin consoles where I can pre-set this for our users.

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Vasil Michev (MVP)Commented:
You can use Set-MailboxJunkEmailConfiguration to configure this per-user.
fieldjAuthor Commented:
Is there a way I can specify this for all users?  What about if I create a new user, would I have to remember to do this everytime?
Saif ShaikhServer engineer Commented:
For all mailboxes you can connect to O365 powershell and run command: get-mailbox | set-MailboxJunkEmailConfiguration
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Saif ShaikhServer engineer Commented:
$UserCredential = Get-Credential
$Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri -Credential $UserCredential -Authentication Basic -AllowRedirection
Import-PSSession $Session

You can then test your connection by typing the command below. It will display mailbox information if you are connected:


Now you are ready to make the change. The command below will turn off Junk Mail filtering for all users in the company. If there are service mailboxes in use that have never been logged into, you will see errors for those accounts when the change is attempted to be applied there. The script will then move on the the next mailbox until completion.

Get-Mailbox | Set-MailboxJunkEmailConfiguration –Enabled $False
fieldjAuthor Commented:
Would I have to periodically repeat this task if I added new mailboxes?
Saif ShaikhServer engineer Commented:
Yes you have to...
fieldjAuthor Commented:
Ok, thanks.  I will give this a try and get back with my results.  Thanks for the help so far.
fieldjAuthor Commented:
Thanks, I gave it a try and that seems to be working perfectly.

If I were to run this on a weekly scheduled task, is there a way I can (securely) store the O365 user credentials in the script?
Saif ShaikhServer engineer Commented:
The below should work for all users..

$Domains = ""
$users = get-mailbox -ResultSize "unlimited"

ForEach ($user in $users) {

$SetDomain = Get-MailboxJunkEmailConfiguration -Identity $user
$SetDomain.TrustedSendersAndDomains += $Domains
Set-MailboxJunkEmailConfiguration -Identity $user -TrustedSendersAndDomains $SetDomain.TrustedSendersAndDomains


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There arr Different ways to store credentials in a Script.
Have a look there for instance:
fieldjAuthor Commented:
Thanks for the help
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