mails not delivered /var/lib/imap/socket/lmtp locker error in mails

[thomasl]

Hi,

We r using Postfix in SUSE SLES 10.
we keep getting random mail bounce error message:

/var/lib/imap/socket/lmtp[/var/lib/imap/socket/lmtp] said: 110 lockers (in reply to end of DATA command)

and

/var/lib/imap/socket/lmtp[/var/lib/imap/socket/lmtp] said: 250 2.1.5 ok (in reply to DATA command)

any ideas what this means?

Thanks