Sometimes its better to let them figure it out themselves.

[yduras.livejournal.com]

Customer, unaware of our internal structure, sends attachment to wrong department.

Helpful monkey in wrong department forwards email to me, but drops the attachment in the process.

I email customer. Would he mind terribly firing another copy directly to me?

Sure, replies the customer. What's your email address?

I blink. I put message off to the side, answer a few other emails, get a cup of tea.

Another email from the customer arrives, with the attachment, and no comment.

Thank you, customer. Work will now ensue.