Hi, In guix documentation we have the following command to send the cover letter of a patch serie: git send-email outgoing/0000-cover-letter.patch -a \ --to=guix-patches@debbugs.gnu.org \ $(etc/teams.scm cc-members ...) However, Gmail responded with the following error: 550 Unrouteable address To solve this issue, I changed the email adress from guix-patches@debbugs.gnu.org to guix-patches@gnu.org it worked. Is it a documentation typo ?