* Iain Sandoe: >> On 24 May 2023, at 14:09, Paul Koning via Gcc <gcc@gcc.gnu.org> wrote: >> Curious, because Mac OS mail does show it as a mailing list message, >> offering up an "unsubscribe" button. So it looks like an iOS mail bug. > > for me, in macOS mail “it depends” - sometimes the posts are marked as > from a list (with the unsubscribe button present), sometimes they are > not; I wonder if that depends on the CC’s etc.
Gmail throws away incoming messages if it deems them substantially similar to a message it has already stored. So if the direct message arrives first, your mail client won't be able to access the List-Id: header because Gmail discarded the message that had it. (This limitation is present in the Gmail web interface, too.) Thanks, Florian
