Manage Email Junk Safe and Blocked senders for specific users.

connect to o365.

$UserCredential = Get-Credential

#connect to exchange 0365

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

Import-PSSession $Session

get-mailboxjunkemailconfiguration -identity johndoe

Add domain and email to trusted senders list.

Get-Mailbox  johndoe |Set-MailboxJunkEmailConfiguration -TrustedSendersAndDomains @{Add="random.com","jane@somedomain.com"}

Remove domain and email from trusted senders list.

Set-MailboxJunkEmailConfiguration -Identity johndoe -TrustedSendersAndDomains @{Remove="<domain name>","<E-mail address>"}