IMAP-3.0.4

[James B. Byrne]

Using imapsync we are attempting to move our mail store from an
Cyrus-IMAPd-2.3.16 running under CentOS-6.9 to a Cyrus-IMAPD-3.0.4
running under FreeBSD-11.1p6.  In all instances we are using software
as packaged by the respective distribution.

On our existing system our user mailboxes are referenced using
user.mailbox.  On the new system we can create mailboxes with the same
nomenclature (user.mailbox).  However, when we try to transfer an
existing mailbox to the new server via imapsync it does not use the
existing mailbox given by user.mailbox.  Instead, it seems to create
on the target host a new mailbox called user/mailbox distinct from
user.mailbox.

My question is: What configuration issue is causing this discrepancy
between expected (user.mailbox --> user.mailbox) and observed
behaviour (user.mailbox --> user/mailbox)?

The the non-default settings in imapd.conf on the target system are:

syslog_prefix:              CYRUS
syslog_facility:            MAIL
admins:                     cyrus admin
configdirectory:            /var/imap
partition-default:          /var/spool/imap
sieveusehomedir:            false
sievedir:                   /var/imap/sieve
allowplaintext:             true
anyoneuseracl:              true
autocreate_inbox_folders:   delivery|\
                            delivery.forwarding|\
                            delivery.imports|\
                            delivery.private|\
                            Drafts|\
                            Intray|\
                            Sent|\
                            Spamyes|\
                            Spamno|\
                            Trash
autocreate_quota:           102400
autocreatequota_units:      1048576
autocreate_subscribe_folders:  delivery|\
                            delivery.forwarding|\
                            delivery.imports|\
                            delivery.private|\
                            Drafts|\
                            Intray|\
                            Sent|\
                            Spamyes|\
                            Spamno|\
                            Trash
client_timeout:             10
hashimapspool:              1
lmtp_downcase_rcpt:         true
lmtp_fuzzy_mailbox_match:   true
quotawarn:                  5
sasl_mech_list:             PLAIN
sasl_pwcheck_method:        saslauthd
sendmail:                   /usr/sbin/sendmail
tls_client_ca_file:   /usr/local/etc/pki/tls/certs/ca-bundle.crt
tls_server_cert:      /usr/local/etc/pki/imapd/20160039.pem
tls_server_key:       /usr/local/etc/pki/imapd/20160039.key

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James B. Byrne                mailto:ByrneJB at Harte-Lyne.ca
Harte & Lyne Limited          http://www.harte-lyne.ca
9 Brockley Drive              vox: +1 905 561 1241
Hamilton, Ontario             fax: +1 905 561 0757
Canada  L8E 3C3