Zimbra version:
Release 6.0.14_GA_2928.DEBIAN5 DEBIAN5 FOSS edition.

I've been reading and searching the forums and see lots of things on how to do this using imapsync. I keep getting errors, I feel like I'm getting closer, but I know the issue is somehow related to the configuration of my Zimbra server. It originally would not let me log in using any authentication methods. I found how to allow PLAIN on the server so I did that, but still no go.

I'm stuck here and would love and appreciate any help.

My imapsync command is:
imapsync --host1 mail.domain.com --user1 me@domain.com --password1 123456 --host2 mail2.domain.com --user2 newuser@domain.com --password2 654321 -authmech2 PLAIN --ssl2 --port2 993
The result I am getting is:
Turned ON syncinternaldates, will set the internal dates on host2 same as host1.
TimeZone :[PST]
Will try to use CRAM-MD5 authentication on host1
Will try to use PLAIN authentication on host2
From imap server [mail.domain.com] port [143] user [me@domain.com]
To   imap server [mail2.domain.com] port [993] user [newuser@domain.com]
Banner : * OK domain.com IMAP4rev1 MDaemon 10.0.2 ready
Host mail.domain.com says it has CAPABILITY for AUTHENTICATE CRAM-MD5
Success login on [mail.domain.com] with user [me@domain.com] auth [CRAM-MD5]
Banner : No banner
Host mail2.domain.com says it has CAPABILITY for AUTHENTICATE PLAIN
Error login : [mail2.domain.com] with user [newuser@domain.com] auth [PLAIN]: 2 NO AUTHENTICATE failed

Trying LOGIN Auth mechanism on [mail.domain2.com] with user [newuser@domain2.com]
Error login : [mail2.domain.com] with user [newuser@domain.com] auth [LOGIN] : 3 NO LOGIN failed
My IMAP config from Zimbra:
mail2:/# zmprov gs mail2.domain.com | grep Imap
zimbraImapBindOnStartup: TRUE
zimbraImapBindPort: 143
zimbraImapCleartextLoginEnabled: TRUE
zimbraImapExposeVersionOnBanner: FALSE
zimbraImapMaxRequestSize: 10240
zimbraImapNumThreads: 200
zimbraImapProxyBindPort: 7143
zimbraImapSSLBindOnStartup: TRUE
zimbraImapSSLBindPort: 993
zimbraImapSSLProxyBindPort: 7993
zimbraImapSSLServerEnabled: TRUE
zimbraImapSaslGssapiEnabled: FALSE
zimbraImapServerEnabled: TRUE
zimbraImapShutdownGraceSeconds: 10
zimbraReverseProxyImapEnabledCapability: ACL
zimbraReverseProxyImapEnabledCapability: BINARY
zimbraReverseProxyImapEnabledCapability: CATENATE
zimbraReverseProxyImapEnabledCapability: CHILDREN
zimbraReverseProxyImapEnabledCapability: CONDSTORE
zimbraReverseProxyImapEnabledCapability: ENABLE
zimbraReverseProxyImapEnabledCapability: ESEARCH
zimbraReverseProxyImapEnabledCapability: ESORT
zimbraReverseProxyImapEnabledCapability: I18NLEVEL=1
zimbraReverseProxyImapEnabledCapability: ID
zimbraReverseProxyImapEnabledCapability: IDLE
zimbraReverseProxyImapEnabledCapability: IMAP4rev1
zimbraReverseProxyImapEnabledCapability: LIST-EXTENDED
zimbraReverseProxyImapEnabledCapability: LITERAL+
zimbraReverseProxyImapEnabledCapability: MULTIAPPEND
zimbraReverseProxyImapEnabledCapability: NAMESPACE
zimbraReverseProxyImapEnabledCapability: QRESYNC
zimbraReverseProxyImapEnabledCapability: QUOTA
zimbraReverseProxyImapEnabledCapability: RIGHTS=ektx
zimbraReverseProxyImapEnabledCapability: SASL-IR
zimbraReverseProxyImapEnabledCapability: SEARCHRES
zimbraReverseProxyImapEnabledCapability: SORT
zimbraReverseProxyImapEnabledCapability: THREAD=ORDEREDSUBJECT
zimbraReverseProxyImapEnabledCapability: UIDPLUS
zimbraReverseProxyImapEnabledCapability: UNSELECT
zimbraReverseProxyImapEnabledCapability: WITHIN
zimbraReverseProxyImapExposeVersionOnBanner: FALSE
zimbraReverseProxyImapSaslGssapiEnabled: FALSE
zimbraReverseProxyImapSaslPlainEnabled: TRUE
zimbraReverseProxyImapStartTlsMode: only
zimbraStatThreadNamePrefix: ImapSSLServer
zimbraStatThreadNamePrefix: ImapServer
Thanks again for any help!