Planning an IMAP migration from shared hosting to a self-hosted setup: 12 domains, ~50 mailboxes. The usual advice is imapsync, and it works — it's incremental, so you can run it repeatedly before DNS cutover and again for the final delta.

But managing 50 accounts via command line across 12 domains gets messy fast: CSV of credentials, per-account flags, batch loops, error handling. If one account fails mid-run, you find out later.

For anyone who's done this at scale — do you script imapsync and live with the overhead, or use a GUI tool with CSV import and per-mailbox mapping? Kernel IMAP Migration Tool handles bulk accounts via CSV, keeps folder hierarchy, and supports incremental sync to avoid duplicates, which is the part that usually breaks manual runs.

Also worth noting: IMAP migration moves emails, attachments and folders only — contacts and calendars need separate handling regardless of tool.

What's your go-to for multi-domain batch migrations?
https://www.nucleustechnologies.com/imap-migration/