Most Anti-Spam filters are based on static rules to determine if a message is a spam. You can also add other blacklists from the Internet, like paid ones.Kerio Connect does not maintain the database, so if the user found their IP in the blacklist, they should directly contact the service that blocks the IP.You can either block the message or increase the spam score.In case Kerio Connect receives all mail from a single host, such as an SMTP gateway, it will not be able to identify the IP address of the originating mail server appropriately. NOTE: This feature is only effective when Kerio Connect receives mail directly from the sender's outgoing mail server. In case you do encounter legitimate senders who are rejected by the blacklist, the IP address can be extracted from the log and added to a whitelisted IP address group. It is important to occasionally review the security log to confirm the volume of rejected emails from blacklists and to make sure it is not rejecting legitimate senders. Enabling these blacklists can significantly reduce spam however, some legitimate emails may be rejected.
On a default installation, Kerio Connect includes a small list of well-known Internet blacklists. IP Address Groups can also be excluded from Spam Repellent. Spam Repellent also decreased the load on the server because other anti-spam and antivirus tests do not process messages rejected by Spam Repellent. The log above means that the server has started to send SMTP commands and the data too early, which is indicative of spam as normal mail servers would wait. Here is a sample entry in the security logs when Spam Repellent is on: SMTP Spam attack detected from 71.6.232.5:52864, client sent data before SMTP greeting. By introducing delays and flow checks at the beginning of the SMTP communication, many automated tools will give up while legitimate email is not affected.
To send large volumes of spam, the automated spam-sending tools cannot afford to spend too much time communication with the receiving mail server. Here is an explanation from the Kerio Connect administration interface: It delays the SMTP greeting that prevents delivery of messages sent from spam servers. The Spam Repellent is a simple but very effective spam filter. This default action can be disabled in the configuration file ( mailserver.cfg). Kerio Connect discards the message or forwards it to a quarantine address depending on the settings. The default action if BitDefender recognizes malware or a phishing message is to reject the message regardless of the other Kerio Connect settings, such as whitelists or custom rules.It connects to *. on port 443 (HHTPS) and on port 80 (HTTP) to communicate to BitDefender.Without Kerio Anti-Spam Advanced filter, you can still use the standard anti-spam features in Kerio Connect. Kerio Connect calculates the spam score using a unique algorithm and adds the score to the overall spam rating.įacts about the Kerio Anti-Spam Advance filter:.BitDefender scans the data and sends the result to Kerio Connect.Kerio Connect sends encrypted data to the BitDefender online scanning service.
When Kerio Anti-Spam is enabled, the following happens when Kerio Connect receives a message: The Kerio Anti-Spam extension uses the BitDefender online scanning service and provides an advanced level of spam filtering on incoming messages.
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