Kat, that is done, you could have safely handled this yourself via [1], that as a future note :)

[1] https://mail.gnome.org/mailman/admin/sponsorship-committee/privacy/recipient

Could you tell me how? :)

I see two problems with that:
1) I have nothing to do with the sponsorship-committee
2) it's the list of aliases that needs to be edited, not the mailing list

Kat,

sponsorship-committee is a mailing list with a set of admins (Neil in this case), if you are required to have that m-l being able to receive emails (on the To or CC fields) from an email that doesn't match the destination (sponsorship-committee@gnome.org) you have to land an alias on the aforementioned URL, that's what I added. The additional point was you don't need external help as mailing lists are self-service in pretty much all the cases. If that's not what you requested please let me know.

Wouldn't you need to add sponsorship-committee@g.o to here? https://infrastructure.gnome.org/browse/puppet/tree/modules/postfix/files/virtual-aliases/virtual-guadec.org#n3

Discussed this quickly with Kat on IRC. [1] should address what she requested on this side.

[1] https://infrastructure.gnome.org/browse/puppet/commit/?id=3958658