rsync error: some files/attrs were not transferred

I'm trying to move my emails Maildir from an old CentOS server to a new Debian server. rsync -avz /home/me/Maildir ssh root@ipaddress:/var/vmail/me/Maildir I tried to copy a 8GB account, didn't work, try to move another about 20mb, didn't work, tried to use -avn, didn't work either. sync error: some files/attrs were not transferred (see previous errors) (code 23) at main.c(1039) [sender=3.0.6]