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Information on Open Relay
a) What is an Open Relay?
An Open Relay refers to a mail server that allows third-parties to send mail to other third-parties. It occurs when the mail server processes a mail message where neither the sender nor the recipient is a local user.
b) Why do open relays represents a problem?
If your mail server acts as an open relay, anyone could access it and pass spam (unsolicited commercial email) through your server.
Not only could this overload your server but it could damage your reputation because it will appear that you sent the spam.
As a result, your server may be blacklisted by other Internet Service providers in the world. Once blacklisted, none of the email that sent via your server can reach these ISPs.
c) How do I find out if I am running an open relay?
Network Abuse Clearinghouse provides a mail relay testing service on their website which runs in two modes.
Simply filled up the web form to let them test your system.
d) How do I close my Open Relay?
MAPS compiles an extensive list of resources on how to secure your current mail system against third-party relay (open relay).
e) Where can I read more about Open Relay?
You can read up more about Open relay at the Mail Abuse Prevention System (MAPS) website.