imapsync some mails are not transferred

Question

Im using this code:

imapsync --buffersize 8192000 --nosyncacls --subscribe --syncinternaldate --noauthmd5 
--host1 old.server --user1 old.user --password1 123456 
--host2 localhost --user2 [email protected] --password2 123456

Result is:

Initial difference host2 - host1  : -1559 messages, -258705799 bytes (-246.721 MiB)
Final   difference host2 - host1  : -6 messages, 34513 bytes (33.704 KiB)
Detected 0 errors

So 6 messages are not transferred. What could be the problem?

Answer 1

Missing messages can be duplicates on host1. See whole final statistics.