Overview
The IP Blocklist is a custom database of IP addresses from which you never want to receive emails. The IP Blocklist filter is NOT enabled by default.
This article describes the steps necessary to configure the IP Blocklist filter.
Information
- Open the MailEssentials Configuration UI
- Navigate to Anti-Spam > Anti-Spam Filters > IP Blocklist:
- From the General tab, select Enable IP Blocklist to block all emails received from specific IP addresses:
- In the IP Blocklist Entry box, specify the IP addresses to block:
Option Description Single computer / CIDR Key in a single IP address or a range of IP addresses using CIDR notation. Group of computers Specify the Subnet Address and Subnet Mask of the group of IPs to whitelist.
Description Optionally, add a description to help identify the specified IPs. - Click Add to add the specified IP addresses to the IP Blocklist box.
- In the IP Blocklist Entry box, specify the IP addresses to block:
- To delete IP addresses from the IP Blocklist, select the addresses to remove and click Remove.
- Open the Actions tab to select the actions to perform on messages identified as spam. For more information refer to the "Configuring MailEssentials Spam Actions" article.
Note
If the IP Blocklist filter is set to run at the SMTP level, only the Log rule occurrence to this file option will be available in the Actions tab.
- Click Apply.
This filter can be configured to execute when the full email is received or at the SMTP level, that is, emails are filtered while they are being received.
SMTP level filtering terminates the email’s connection and therefore stops the download of the full email, economizing on bandwidth, and processing resources.
In this case, the connection is terminated immediately and emails are not required to go through any other anti-spam filters. For more information refer to the "SMTP Transmission Filtering" article.