Migrating from Olde server to Dovecot

[Hendrik Velloen]

Hi

I am new to the mailing List, and was hoping to get some assistance
migrating from an Old Cucipop + Sendmail server (running on a old Redhat v
7) to a new Dovecot setup.
My new installation is Dovecot + Postfix. All is setup and working, however
I want to trasnsfer the contents of the mailboxes from my old server to
this new Dovecot setup.

Please let me know what information will be required to transfer the
mailboxes - I have tried a number of things, but with no luck.

I think the correct method is the one below, but I am getting UIDL errors
and AUTH errors and not sure if this is the right approach ----  PLEASE HELP

dsync -u <DOVECOT_USER> mirror
mbox:~/mail:INBOX=<MAIL_BOX_COPIED_FROM_OLD_SERVER>

~#  dsync -u hendrikv at tcmvpn.co.za mirror
mbox:~/mail:INBOX=/var/mail/User_mbox/hendrikv

dsync(hendrikv at tcmvpn.co.za): Error: pop3c(196.26.136.162): AUTH PLAIN
failed: -ERR Invalid command, try one of: USER name, PASS string, APOP name
digest, QUIT
dsync(hendrikv at tcmvpn.co.za): Error: pop3c: Disconnected from remote server
dsync(hendrikv at tcmvpn.co.za): Error: pop3_migration: Couldn't sync mailbox
POP3-MIGRATION-NS/INBOX: Internal error occurred. Refer to server log for
more information. [2016-04-04 08:27:01]
dsync(hendrikv at tcmvpn.co.za): Error: Mailbox INBOX: Remote didn't send mail
GUID=ddbe5c71e58919cfe2a40905bced091d (UID=3054)
dsync(hendrikv at tcmvpn.co.za): Error: Mailbox INBOX: Remote didn't send mail
GUID=64087a4c7bf960114cf17ba044047900 (UID=374)
dsync(hendrikv at tcmvpn.co.za): Error: Mailbox INBOX: Remote didn't send mail
GUID=fd28baf9e91aedaf06c6e979ca76e96f (UID=2982)
dsync(hendrikv at tcmvpn.co.za): Error: Mailbox INBOX: Remote didn't send mail
GUID=607087e611559d2df02c0684de87e10d (UID=991)
dsync(hendrikv at tcmvpn.co.za): Error: Mailbox INBOX: Remote didn't send mail
GUID=c6a9aebd1f535f0cd82ed612a42bae77 (UID=1541)
dsync(hendrikv at tcmvpn.co.za): Error: Mailbox INBOX: Remote didn't send mail
GUID=4c56ffcfb600c8b216b2f1603383dc13 (UID=1007)
dsync(hendrikv at tcmvpn.co.za): Error: Mailbox INBOX: Remote didn't send mail
GUID=96ce5556fab323206f51deb03625be8a (UID=2357)
dsync(hendrikv at tcmvpn.co.za): Error: Mailbox INBOX: Remote didn't send mail
GUID=cda74cb161321b7c99973cc65e80a591 (UID=1401)
dsync(hendrikv at tcmvpn.co.za): Error: Mailbox INBOX: Remote didn't send mail
GUID=b735acf7ef69b39be157a97223878cdc (UID=642)
dsync(hendrikv at tcmvpn.co.za): Error: Mailbox INBOX: Remote didn't send mail
GUID=6d9baedf21198be32152461f96737a1a (UID=481)
dsync(hendrikv at tcmvpn.co.za): Error: Mailbox INBOX: Remote didn't send mail
GUID=19f36b934b74ce11f1eda95e32a0b112 (UID=1998)
dsync(hendrikv at tcmvpn.co.za): Error: Exporting mailbox INBOX failed: Can't
lookup pop3-uidl for UID=1: POP3 UIDLs couldn't be synce

-- 
Kind Regards
Hendrik