Testing imapsync v1.223 from a test account under uw-imap to Zimbra 4.5.7 NE

I'm running it with the following params:

--buffersize 8192000 --nosyncacls --subscribe --syncinternaldates \
--noauthmd5 ...

All folders got created, but no mail was transferred. Errors show as:

+ NO msg #57 [zRBqSixZzLW3oRh/L4/ohA:3056] in MYFolder
+ Copying msg #57:3056 to folder MYFolder
flags from : [\Seen]["13 Jun 2002 18:11:04 -0400"]
2107 BAD parse error: invalid date format
at /usr/local/bin/imapsync line 1178
Couldn't append msg #57 (Subject:[RE: subject...]) to folder MYFolder:
2107 BAD parse error: invalid date format

Any hints ??? TIA...