Ben Finney wrote:
Many people participate in mailing lists without being subscribed to them (e.g. via Gmane). There is no way for the mailing list to know whether this is the case.
True...
In that case, the recipient doesn't want *any* copies of the message in their email.
...But don't generalize, please. I read this list as a newsgroup (and many others), but I don't mind, and even appreciate when people CC me.
Which is what they've taken care of by not subscribing their email address to the list.
Not necessarily. It's just a matter of habit for me -- if the list is available as a newsgroup, I read it as a newsgroup. (Another reason is to reduce the load on my spam filter -- if I had to receive every message I read as email, that scruffy machine would experience sky-high load.)