[CentOS] syncing imap servers with imapsync

hello list,

 I am attempting to sync two imap servers using the imapsync perl script. It seems handy and easy.


Here's what happens when I try to do this:

#
# Postfix master process configuration file.  For details on the format
# of the file, see the master(5) manual page (command: "man 5 master").
#  -o smtpd_sasl_auth_enable=yes
#  -o smtpd_client_restrictions=permit_sasl_authenticated,reject
#smtps     inet  n       -       n       -       -       smtpd
virtual   unix  -       n       n       -       -       virtual
lmtp      unix  -       -       n       -       -       lmtp
anvil     unix  -       -       n       -       1       anvil
scache    unix  -       -       n       -       1       scache
amavis    unix  -       -       -       -       2       smtp
          -o smtp_data_done_timeout=1200
          -o smtp_send_xforward_command=yes
[root at mail3 skins]# imapsync --syncinternaldates --host1 mail.example1.com --user1 bluethundr --password1 secret --host2 roundcube.example2.com --user2 bluethundr --password2 secret
[root at mail3 skins]# imapsync --syncinternaldates --host1 mail.example1.com --user1 bluethundr --password1 secret --host2 roundcube.example2.com --user2 bluethundr --password2 secret
$RCSfile: imapsync,v $ $Revision: 1.456 $ $Date: 2011/08/24 04:21:30 $
Here is a [linux] system (Linux mail3.example1.com 3.0.4-x86_64-linode21 #1 SMP Thu Sep 1 21:28:01 EDT 2011 x86_64)
With perl 5.8.8 Mail::IMAPClient  3.28
Command line used:
/usr/bin/imapsync --syncinternaldates --host1 mail.example1.com --user1 bluethundr --password1 MASKED --host2 roundcube.example2.com --user2 bluethundr --password2 MASKED
Temp directory is /tmp
PID file is /tmp/imapsync.pid
Modules version list:
Mail::IMAPClient     3.28
IO::Socket           1.29
IO::Socket::INET     1.29
IO::Socket::SSL      1.01
Digest::MD5          2.36
Digest::HMAC_MD5     1.01
Term::ReadKey        2.30
Authen::NTLM         1.09

Info: turned ON syncinternaldates, will set the internal dates (arrival dates) on host2 same as host1.
Info: will try to use LOGIN authentication on host1
Info: will try to use LOGIN authentication on host2
Host1: imap server [mail.example1.com] port [143] user [bluethundr]
Host2: imap server [roundcube.example2.com] port [143] user [bluethundr]
Banner: * OK mail.example1.com Zimbra IMAP4rev1 server ready
Info: host mail.example1.com says it has NO CAPABILITY for AUTHENTICATE LOGIN
Info: success login on [mail.example1.com] with user [bluethundr] auth [LOGIN]
Banner: * OK [CAPABILITY IMAP4rev1 UIDPLUS CHILDREN NAMESPACE THREAD=ORDEREDSUBJECT THREAD=REFERENCES SORT QUOTA IDLE ACL ACL2=UNION STARTTLS] Courier-IMAP ready. Copyright 1998-2011 Double Precision, Inc.  See COPYING for distribution information.
Info: host roundcube.example2.com says it has NO CAPABILITY for AUTHENTICATE LOGIN
Failure: error login [roundcube.example2.com] with user [bluethundr] auth [LOGIN]: 2 NO Login failed.
Failure: error login [roundcube.example2.com] with user [bluethundr] auth [LOGIN]: 2 NO Login failed.
[root at mail3 skins]# 




I can log into both imap servers without any problem. Server1 is a zimbra server and Server2 is a plain vanilla postfix setup with courier imap. I believe the problem is with courier authlib and the advertised capabilities of that server.


Info: host mail.example1.com says it has NO CAPABILITY for AUTHENTICATE LOGIN


This is my authmodulelist on server2.


authmodulelist="authuserdb authpam authpgsql authldap authmysql authcustom authpipe"

This is all I see in the postfix logs on the second server when the authentication failure happens:


Dec  3 22:54:59 li135-81 imapd: Connection, ip=[::ffff:69.164.220.81]
Dec  3 22:55:01 li135-81 imapd: LOGIN FAILED, user=bluethundr, ip=[::ffff:69.164.220.81]
Dec  3 22:55:06 li135-81 imapd: Disconnected, ip=[::ffff:69.164.220.81], time=7
Dec  3 22:55:15 li135-81 imapd: Connection, ip=[::ffff:127.0.0.1]
Dec  3 22:55:15 li135-81 imapd: LOGIN, user=bluethundr at exmaple2.com, ip=[::ffff:127.0.0.1], port=[57141], protocol=IMAP
Dec  3 22:55:15 li135-81 imapd: LOGOUT, user=bluethundr at example2.com, ip=[::ffff:127.0.0.1], headers=0, body=0, rcvd=94, sent=460, time=0

I'm thinking I need to find a way for server2 to authenticate via plaintext for this to happen. 

I'd appreciate any advice you might have.

thanks in advance
tim