[All] 'all' list migration

[Heather Ellsworth]

Hello Everyone,

Yesterday we migrated the 'all' list from @lists.puri.sm to
@lists.community.puri.sm (so that it's more obvious that these lists are
public).

You have all been moved over to this new subdomain so please make note
of it and email all at lists.community.puri.sm in the future.

The old @lists.puri.sm subdomain will be removed and the old email lists
will not work.

Thank you for your understanding,
Heather Ellsworth