Hello everyone,
I recently migrated 114 mailboxes from a legacy Zimbra server to Carbonio (Zextras). While the migration seemed successful and all emails are visible in the Carbonio Webmail, we are facing a critical issue with IMAP clients (Thunderbird, K9 Mail).
The Problem: IMAP clients only see/sync emails up to the migration date. Any new emails arriving after the migration are visible in Webmail but are NOT fetched by IMAP clients.
Environment:
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Carbonio CE (latest)
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Clients: Thunderbird on Windows Server 2016 (Terminal Server), K9 Mail on Android.
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Migration path: Zimbra TGZ export/import.
What we have tried so far:
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Reindexing: Ran
zmprov reIndexMailbox user@domain.com start. No change for IMAP clients. -
Manual UID Bump: If we create a temporary folder, move messages there and then back to Inbox, the IMAP client "wakes up" and sees the messages because they received new UIDs.
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New Profile: Creating a completely new IMAP profile in K9 Mail still shows only old messages (pre-migration).
Observation: It seems that the UIDNEXT or MODSEQ values are somehow inconsistent or the IMAP index is corrupted in a way that doesn't trigger a sync for new items.
My Question: Is there a more efficient way to "reset" or "restart" the IMAP UID sequence (UIDVALIDITY/UIDNEXT) for a mailbox or a specific folder without manually moving thousands of messages back and forth? With 114 users and some mailboxes having 70k+ messages, the manual "move" method is extremely slow.
Is there any CLI command or database script to force a regeneration of the IMAP index/UIDs for a given account?
Thank you for any advice!