I am not sure if this is the correct mailing list but I did not see a
better one to use.
I have been trying to unsubscribe from some mailing lists and the process
does not seem to be working. As an example I sent an unsubscribe request
for libstdc++-digest, got a reply asking me to confirm, when I did a reply
in order to confirm I got:
| Acknowledgment: The address
| prvs=82067f4a26=[hidden email] |
| was not on the libstdc++-digest mailing list when I received
| your request and is not a subscriber of this list.
| If you unsubscribe, but continue to receive mail, you're subscribed
| under a different address than you currently use. Please look at the
| header for:
| 'Return-Path: <libstdc++-digest-return-1234-user=[hidden email]>'