How to tell in site.py if python is being invoked interactively?

[Alex]

Hi, Randall.

No, I just have control over the python program they're going to use.

Sorry about the bogus address.  If I set the Mail-Followup-To header to
the list address, won't replies to my messages that are CC'd to the
newsgroup show up twice?  On the other hand, a null address means mail
people send me just disappears...

Alex.