forward Exchange 2010 mailbox to an external mailbox in Power Shell

Email forwarding in Powershell

The reason a MailContact is generally used for forwarding purposes in Exchange is because you can't set forwarding on a mailbox on the server level to a domain that isn't configured as an Accepted Domain.  How many different external addresses are you forwarding to?  

Here is an example of the one-liner you can run to configure forwarding:

Set-Mailbox <mailbox> -ForwardingAddress user@externaldomain.com -DeliverToMailboxAndForward $false

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Can you give more detail, what exactly you are looking. Are you trying to forward specific email or all emails. Did you enable forward option at org level?

Potentially there are around 700 mailboxes that I need to forward to an External (not accepted) domain.
I can generate .csv file with a list of all the forwarding (target) email addresses but this will be done in stages and would require several .csv files. I hope that answers your question.
Thank you.

Hello Jason,

Just tested a script that you provided and it only works if I have an existing "Mail Contact" in place, without  Contact it doesn't work for me.

Thanks.

Thank you for your reply. Once forwarding is setup, what's the command to stop forwarding if I need.

Just remove forwarding address.

Import-Csv C:\users.csv | ForEach{Set-Mailbox $_.alias -ForwardingSMTPAddress $null}