[little OT] message-id

[Robert Chien]

Hi,

I have two general mail questions:

1. can it be guaranteed that _EVERY_ email has a message-id?
2. if not, can you generate a message-id?

Background: I'd like to write a perl script whose input is a
mail folder, and the script looks at each individual email's
message-id and do something with it (if it sees a duplicate,
then ignore the duplicate, etc). If it doesn't find one,
what should be done?

Thanks!

Robert