spamming AOL

my exim_mainlog is filled with those mesages:

2004-08-10 20:26:50 1Bug10-0002pU-FJ == arayn@aol.com R=lookuphost T=remote_smtp defer (-53): retry time not reached for any host
2004-08-10 20:26:50 1Bug10-0002pU-FJ == arayn69@aol.com R=lookuphost T=remote_smtp defer (-53): retry time not reached for any host
2004-08-10 20:26:50 1Bug10-0007mI-Tg == nickyb725@aol.com R=lookuphost T=remote_smtp defer (-53): retry time not reached for any host
2004-08-10 20:26:50 1Bug10-0007mI-Tg == nickyb727@aol.com R=lookuphost T=remote_smtp defer (-53): retry time not reached for any host
2004-08-10 20:26:50 1Bug10-0007mI-Tg == jiggermack@aol.com R=lookuphost T=remote_smtp defer (-53): retry time not reached for any host
2004-08-10 20:26:50 1Bug10-0007mI-Tg == araynbird@aol.com R=lookuphost T=remote_smtp defer (-53): retry time not reached for any host
2004-08-10 20:26:50 1Bug10-0007mI-Tg == nickyb732802@aol.com R=lookuphost T=remote_smtp defer (-53): retry time not reached for any host
it seens my server is sending spam to random(?) aol users

i don't know what may be causing that... my server is not an open relay... maybe some php script, but since all my users are brazilian, i doubt they would spam AOL...

it happens just some times of the day

any suggestions to stop/track that?

thanks in advance

 

 

 

 

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