The rbl-filter blacklist ip command adds an IP address to the local blacklist for anti-spam.
The undo rbl-filter blacklist command deletes an IP address from the local blacklist.
rbl-filter blacklist ip ip-address [ wildcard { wildcardlen | wildcard } | mask { mask-length | mask } ]
undo rbl-filter blacklist { all | ip ip-address [ wildcard { wildcardlen | wildcard } | mask { mask-length | mask } ] }| Parameter | Description | Value |
|---|---|---|
| ip ip-address | Specifies the IP address to be blacklisted. SMTP packets with blacklisted source IP addresses are blocked. |
The value is in dotted decimal notation. |
| wildcard wildcardlen | Specifies the wildcard mask length of the IP address, that is, the length of the inverted mask of the IP address. |
The value is an integer ranging from 0 to 32. For example, the length of the inverted mask 255.255.255.0 is 8. |
| wildcard wildcard | Specifies the wildcard mask of the IP address, that is, the inverted mask of the IP address. |
The value is in dotted decimal notation. |
| mask mask | Specifies the mask of the IP address. |
The value is in dotted decimal notation. |
| mask mask-length | Specifies the mask length of the IP address. |
The value is an integer ranging from 0 to 32. For example, the length of mask 255.255.255.0 is 24. |
| all | Deletes all blacklisted IP addresses. |
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The FW filters out junk mails by performing legitimacy check on the sender's SMTP server IP address. Upon receiving an SMTP message, the FW obtains the source IP address and determine whether the IP address is legitimate.
If a sender's source IP address matches the blacklist, the FW blocks the email and does not implement RBL filtering. If you have received junk mails from certain SMTP servers or have identified some SMTP servers as junk mail sources, add the IP addresses of these SMTP servers to the local blacklist. The FW discards the emails from these servers.
No IP addresses are blacklisted by default.