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Every sending domain has a region. The region controls where Signal handles that domain’s sending path.

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Available regions

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Default behavior

For projects without multi-region domain capability, new domains use the project’s region. The dashboard shows that region as locked and offers an upgrade path where multi-region is available. When the capability is enabled, choose a supported region while adding the domain. Choose the region closest to the main recipient population while accounting for your data-location requirements.
You cannot change the domain region after adding the domain. A different region requires a new domain registration and a controlled sender migration.

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Migration approach

  1. Add the replacement sending domain in the target region.
  2. Publish and verify all authentication records.
  3. Configure tracking and BIMI where required.
  4. Update one controlled caller or traffic slice.
  5. Compare delivery and webhook behavior.
  6. Move remaining From addresses.
  7. Delete the old domain only after no callers use it.

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Region is not inbox placement

A closer sending region can reduce service latency. It does not replace domain reputation, recipient consent, content quality, authentication, or mailbox-provider policy.