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Originally Posted by BritTim

If you use your own domain, also read this thread

I do use my own domain, and just looked at that thread. How does that distinguish?

Also, I don't want to discard the message -- I want to keep it, but I want the sender to receive a bounce.

I have told my office colleagues and managers not to email me at my personal email address while on leave, so I only want to do this with emails from my workplace.

First, I need to see what a normal bounce looks like.