{
  "_comment": [
    "Optional: which Stalwart a domain signs in to.",
    "",
    "STALWART_URL stays required and stays the default. This file only adds",
    "domains that go somewhere else -- delete it and nothing changes.",
    "",
    "Point at it with STALWART_SERVERS_FILE=/etc/ihasmail/servers.json and mount",
    "it read-only. Read once at startup, so editing it means restarting.",
    "",
    "A domain that is not listed here, and a bare username with no domain at",
    "all, go to STALWART_URL. A domain that IS listed never falls back: if its",
    "server is unreachable that sign-in fails, because falling back would",
    "authenticate somebody against a server their domain was routed away from.",
    "",
    "Keys are lower-cased and stripped of a trailing dot when read. Malformed",
    "JSON, a duplicate domain, or a value that is not an http(s) URL stops the",
    "server at startup rather than failing quietly at somebody's sign-in.",
    "",
    "Docs: https://docs.ihasmail.org/configure/#several-stalwart-servers"
  ],

  "example.com": "https://mail.example.com",
  "customer-b.test": "https://jmap.customer-b.test"
}