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I have a cyrus-imapd server running for last five years. The cyrus-imapd version is 2.2. Now I have set up a new mailbox server with cyrus-imapd version 2.3. I need to migrate all mailboxes to this new server. As far as I know I should follow either of the following two methods.

  1. Use imapsync to transfer mailboxes
  2. rsync all mailboxes to new server and then reconstruct all of them on new server

I do not want to setup imapsync so rsync followed by reconstruct remains.

But I tried moving random five mailboxes to new server without following reconstruct. I did following.

  1. rsync mailboxes to new server
  2. copied mailbox-name.seen and mailbox-name.sub from /var/lib/imap/ to new server

And I am able to access those mailboxes without any problem on new server. So can I move mailboxes and corresponding .seen and .sub files directly to new server without following reconstruct? and what exactly reconstruct do?

Note: I am not using any kind of quota on cyrus mailboxes so I don't want any quota figures.

Sachin Divekar
  • 2,653

1 Answers1

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reconstruct reconstructs cyrus' indexes. While they may survive a move from one machine to another, nothing guarantees that they will. Reconstruct is also idempotent, non-destructive and non-intrusive, so you can safely run it on migrated mailboxes.

Dennis Kaarsemaker
  • 19,819