ADDING EMAIL ADDRESSES TO SAFE SENDERS LIST FOR ALL USERS OFFICE 365

1. Connect Windows PowerShell to Exchange Online http://technet.microsoft.com/en-us/library/jj984289(v=exchg.150).aspx

2. Prepare a CSV file to list the users whom you want to change, and this file maybe  contain the user's alias and email address in your organization , and then store it in local disk (for example, F:\UserList.csv ).

For example:

Identity, EmailAddress

userA, userA@test.com

userB, userB@test.com

3. Run the command below to bulk update the safer sender list of all users of your organization:

Import-Csv "F:\UserList.csv"  | foreach { Set-MailboxJunkEmailConfiguration -Identity  $_.Identity -TrustedSendersAndDomains  @{Add=news@domain.com} }

EXPORT LIST OF USER ACCOUNTS FROM OFFICE 365

1.   Download the MSOL Module for Windows PowerShell and connect to the Office 365 service. http://technet.microsoft.com/en-us/library/hh974317.aspx

2.   Run the following cmdlet: 
Get-MSOLUser | select displayname,userprincipalname | Export-CSV userlist.csv