2009-07-20 21:58:07 Failed to get write lock for /var/spool/exim/db/ratelimit.lockfile: timed out
2008-07-20 21:58:07 H=[xx.xx.xx.xx] temporarily rejected connection in “connect” ACL: ratelimit database not available

To fix such an error , the exim cache database on the server side needs to be clear off to stop this message.