Blacklist
A blacklist is a list or register of entities who, for one reason or another, are being denied a particular privilege, service, or mobility.
Open mail relay
An open mail relay is an SMTP (e-mail) server configured in such a way that it allows anyone on the Internet to relay (i.e. send) e-mail through it.
Links relacionados:
http://www.mxtoolbox.com/blacklists.aspx
http://www.ordb.org/
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