How can I resolve 554 5.7.1 Service unavailable message in Exchange Server 2003
This message only appears with an email but do not know if the problem is on my server or the recipient
<ptmxchsvr.domain.local #5.7.1 smtp;554 5.7.1 Service unavailable; Client host [XXX.XXX.XXX.XX] blocked using relays.ordb.org; ordb.org was shut down on December 18, 2006. Please remove from your mailserver.>.
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