Definitions for "Open mail relay"
Keywords:  smtp, sender, relay, mta, recipient
a mail server that allows anyone from anywhere on the Internet to send email through it to a remote recipient
a mail transport agent (MTA) that is configured to forward mail between senders and recipients who are not a part of the MTA's operational domain
an e-mail server that accepts and routes mail from and to users not associated with the server's domain
a host which indiscriminately accepts and forwards email