docs/MAIL.md: "Rollout boundary" is replaced by "Where it runs": Mail runs onmx1, a separate machine, and there is no IMAP or POP access.docs/plans/MAIL_HOSTING.md: the status line no longer says nothing is provisioned; it lists the Phase A application work still open.
Internal: Mail documentation says it runs on mx1
docs/MAIL.md and the mail hosting plan now say Mail is live on mx1 and list the application work still open.