Mailbox Migration

imapsync front-end · internal tool · access token required

Source — read only

Destination — written to

Work down the ladder. Steps 1–3 copy nothing and cannot alter either mailbox. Only step 4 writes, and it only ever writes to the destination — the source is opened read-only and is never modified or deleted from. Re-running step 4 is safe: already-copied messages are recognised and skipped.

Maintenance — duplicate cleanup

Only needed if a mailbox was copied twice. Preview first — it reports what it would remove without touching anything. Deletion affects the destination only; the source is never modified.

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