Should my small non-proft allow users to forward email from our Google Apps account to their personal Gmail? [closed]

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http://serverfault.com – I am a user of multiple gmail accounts and have no problem with using multiple sign-in for my mail access. But we have a new employee that would rather all his email in one inbox. I know he can forward the mail to his personal account, and that a bcc could put a copy of any replies back into his work account, but I feel like I should have some privacy concerns with this. Any input would be great! (HowTos)