The reply-code command configures a reply code.
The undo reply-code command deletes a reply code.
reply-code { reply-code | any } [ description description ]
undo reply-code { all | any | reply-code }
| Parameter | Description | Value |
|---|---|---|
| reply-code | Specifies the reply code. When the reply code is configured, the FW identifies the mails matching the reply code as spam. If the returned message is not reply code, or the returned reply code is different from the reply code configured on the FW, the mail is permitted. |
The value is in dotted decimal notation. You can configure a maximum of 16 reply codes in an RBL filtering profile. |
| any | If the reply code is not obtained, you can set it to any. This indicates that if the RBL server returns reply code (such as 127.0.0.1), the mail is identified as spam. If no message returned or the returned message is not reply code, the mail is permitted. |
- |
| description | Specifies the description of a reply code. |
The value is a case-sensitive string of 1 to 128 characters. Spaces are supported. |
Anti-spam performs legitimacy check on the sender IP address. If the IP address is blacklisted, the FW considers the mail to be a junk mail. To check the legitimacy of the source IP address using the RBL blacklist, the FW sends a query request to the RBL server and determines the legitimacy of the IP address based on the reply code returned from the RBL server.
A reply code is typically an IP address for the identification purpose only. It can be a reserved IP address, such as 127.0.0.1 or 127.0.0.2.
To use the RBL blacklist, obtain a reply code from the RBL service provider and set the reply code on the FW. After receiving the RBL query result, the FW compares the reply code with the one specified on the device. If the two codes are the same, the FW considers the email from this IP address to be a junk mail.