Got a couple of these:
Connected to 12.102.252.75 but sender was rejected.
Remote host said: 550-204.10.107.118 blocked by ldap
u=rblmx,dc=worldnet,dc=att,dc=net
550 Blocked for abuse. See AT&T Worldnet Service
Connected to 12.102.252.75 but sender was rejected.
Remote host said: 550-204.10.107.118 blocked by ldap
u=rblmx,dc=worldnet,dc=att,dc=net550 Blocked for abuse. See AT&T Worldnet Service