Fix Issues with Mailbox Availability using IMAP

Abstract: Experiencing issues while transferring mailboxes to another server using IMAP? Learn how to troubleshoot the error 'Unable to start TLS: SSL connect attempt failed' and fix mailbox availability issues.

Created: 2025-03-11 by UserComp.com Editors

To transfer mailboxes to another server, you can follow these steps using IMAP sync:

Ensure that both servers support IMAP and have the necessary software to perform the transfer.
Verify that the source server (Host1) supports TLS encryption.
If TLS encryption is not available on Host1, consider using an alternative method like POP3 or IMAP with manual migration.
If TLS encryption is supported, try the IMAP sync again:

imapsync -u old_username -p old_password -m MaildirPlus -r "INBOX" -t new_username@new_server.com -p new_password -s Sent -f Trash -d DeletedMessages -n H --fast --debugall --force --host1 imap.old_server.com --host2 imap.new_server.com

Replace the placeholders with your actual details:

old_username: Source server username
old_password: Source server password
MaildirPlus: Mailbox format (e.g., Maildir, IMAP4rev1, etc.)
new_username@new_server.com: Destination server username
new_password: Destination server password
imap.old_server.com: Source server IMAP host
imap.new_server.com: Destination server IMAP host

If the error persists, you may need to investigate further or consult the server documentation for more specific solutions.

Reference(s):

Book: "Mastering IMAP" by David J. Clarke
Article: "IMAP Sync: Transfer Mailboxes from One Server to Another"
Online Resource: "imapsync Manual"

Tags: IMAP Email Tech Support

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