CindyLou wrote:

The list is not in the CC window. It is under the "Original Message"
section.

But what you said was:

An email was forwarded to be by a recipient that has about 300 email
addresses in the cc line.

If you didn't mean they were in the Cc field, you shouldn't have said that's
where they are.

You're out of luck. The "Cc" string in the "Original Message" section of
the message body is just a string of characters that often have no
associated addresses. If that string contains real addresses and looks
something like this:

name one ; name two ; ...etc.

or

"name one" ; "name two" ; ...etc.

or some combination of these, then you can still use the method I describe.
If, however, the "Cc" list name is just a list of "Display As" fields, there
will be no mail addresses associated with them and you're out of luck.
--
Brian Tillman