Imapsync not working with ZIMBRA

From last 1 year I am using imapsync to copy emails from zimbra server to my qmail server but today its stop working .

below is my imapsync command

imapsync --host1 192.168.1.222 --user1 user1@abc.com --password1 pwd --authmech1 PLAIN --ssl1 --authmech2
Plain --host2 192.168.1.8 --user2 user1@abc.com --password2 pwd --ssl1

and below is the error..

Host 192.168.1.8 says it has NO CAPABILITY for AUTHENTICATE PLAIN
Frequently PLAIN is only supported with SSL, try --ssl1 or --ssl2 option
Error login : [192.168.1.8] with user [user1@abc.com] auth [PLAIN]: 3 NO Login failed.

Trying LOGIN Auth mechanism on [192.168.1.8] with user [bounce@zarca.com]
Error login : [192.168.1.8] with user [user1@abc.com] auth [LOGIN] : 4 NO Login failed.

Help please

Try without "--authmech2 Plain"

Nope, did you check your server enable PLAIN authenticate?
you can use "capability" command of imap protocol to check. If enabled, you must see: AUTH=PLAIN in the response

You have -ssl1 twice and no -ssl2 in your command. Could it be the error ?