1. Enable this in powershell first
#Enable Exchange cmdlets
add-pssnapin *exchange* -erroraction SilentlyContinue
2. THEN use one of the following:
Forward mails to another mailbox:
Set-Mailbox user@domain.com -ForwardingAddress dest_mailbox@domain.com
Forward mailbox without saving a local copy:
Set-Mailbox user@domain.com -ForwardingAddress dest_mailbox@domain.com -DeliverToMailboxAndForward $false
Forwarding mails to another external mailbox:
Set-Mailbox user@domain.com -ForwardingSmtpAddress ext_mailbox@domain.com
Forwarding mails to another external mailbox without saving a local copy:
Set-Mailbox user@domain.com -ForwardingSmtpAddress ext_mailbox@domain.com -DeliverToMailboxAndForward $false
Apply the forwarding to users in mass:
Get-Mailbox | Where {$_.RecipientType -eq “UserMailbox”} | Set-Mailbox -ForwardingAddress dest_mailbox@domain.com
Apply the forwarding to users to be sent to external users in mass:
Get-Mailbox | Where {$_.RecipientType -eq “UserMailbox”} | Set-Mailbox -ForwardingSmtpAddress ext_mailbox@domain.com
Get forwarding Info of a user:
Get-Mailbox -Identity user@domain.com | fl DeliverToMailboxAndForward, ForwardingAddress, ForwardingSmtpAddress
Remove mail forwarding:
Set-Mailbox user@domain.com -ForwardingAddress $null
Remove mail forwarding sent to an external user:
Set-Mailbox user@domain.com -ForwardingSmtpAddress $null
Remove mail forwarding to users in mass:
Get-Mailbox | Where {$_.RecipientType -eq “UserMailbox”} | Set-Mailbox -ForwardingAddress $null
Remove mail forwarding sent to external users to users in mass:
Get-Mailbox | Where {$_.RecipientType -eq “UserMailbox”} | Set-Mailbox -ForwardingSmtpAddress $null