[exim] exim4 relay doesn' t send out any mail

Hi!

From one day to another our mailserver doesn't send out any mail over a
mailrelay.
Log tells us:
2005-08-21 17:36:35 1E6rsB-0003n9-M0 SA: Action: Not running SA because
SAEximRunCond expanded to false (Message-Id:
1E6rsB-0003n9-M0). From <l.schimmer@???> (host=NULL
[129.27.224.137]) for schimmer@???
2005-08-21 17:36:35 1E6rsB-0003n9-M0 <= l.schimmer@???
H=([129.27.224.137]) [129.27.224.137] P=esmtpsa X=T
LS-1.0:DHE_RSA_AES_256_CBC_SHA:32 A=plain_saslauthd_server:schimmer
S=1295 id=43089F83.3050206@???
2005-08-21 17:36:35 1E6rsB-0003n9-M0 == schimmer@???
R=smarthost T=remote_smtp_smarthost defer (-53): ret
ry time not reached for any host

Any idea what could happen there?
As the log isn 't very helpful for me right now.

Cya
Lars