I've received the "Relaying Denied" error message, what does this mean?

Issue

I've received the "Relaying Denied" error message, what does this mean?

Solution

The "Relaying Denied" error message is caused by a host that is not recognized as trusted or local trying to send email to recipients that are not on the Mirapoint Message Server.

The causes and solutions are as follows:

The message should have been delivered locally, but instead generated this error.

Cause: The domain name in the destination email address was not recognized as belonging to the machine.

Solution: If the email address is in a virtual or delegated domain, the domain has not been configured on the mail server. See the documentation for instructions. If the domain name is another name for the mail server, add the domain of the email address to maildoms (using the Administration Suite or the Maildom command in the CLI) and to the relay list.

The message came from a local user who tried to use the Mirapoint or RazorGate appliance as their outgoing SMTP server.

Cause: The client's internet address was not recognized as a machine that is allowed to relay. Either the base domain has not been entered into the relay list, or the reverse DNS for the client's machine has not been set up correctly.

Solution: Depending on the exact cause, do one of the following:

Enter the base domain (example.com if the client's machine is called client.example.com) into the relay list. 

As the Mirapoint or RazorGate appliance only knows the IP address of the client and must figure out the name of the client from looking up the IP address in DNS, there must be a PTR record in DNS that contains the machine's name, just as there must be an A record that points the machine's name to a particular IP address.

To determine if this is the problem, use dnslookup on a UNIX machine:

dnslookup clientname

Take the IP address that is returned and enter:

dnslookup IPaddress

If the client's name is not returned, add the IP address of the client into the relay list manually. This can also be done for Classfull subnets (A, B, or C). See the documentation for instructions.

Domain information can be added to the relay list by using the Administration Suite Setup Wizard, or through the CLI Maildom Add command. For more information, see either the Mirapoint Administration Protocol Reference or the CLI online help.