SmarterMail 15.x Help
This documentation is for a product that is no longer supported by SmarterTools.

Blacklist / Whitelist

System administrators are able to control the IP addresses that are blacklisted or whitelisted from accessing mail services. Blacklisting an IP address prevents it from making incoming connections, while whitelisting an IP address adds the IP as a trusted source, allowing connections to bypass relay restrictions that may be imposed. Exercise caution when granting whitelist status to a server, and be sure that you know what services on that server may send mail through your own.

To manage the blacklist or whitelist, click the Security icon and then click Blacklist or Whitelist in the navigation pane.

To create a new entry in the blacklist or whitelist, click New in the content pane toolbar. To edit an entry, click Edit in the content pane toolbar. The blacklist or whitelist settings will load in a popup window and the following options will be available:

  • IP Address - Enter a single IP address in dotted quad notation (X.X.X.X) in this box if you want to add only a single IP (ex:
  • IP Range - Enter a range of IP addresses in the two boxes, and all IP addresses that are contained in the range will be added (ex: -
  • Protocol - Check the boxes for the protocols you wish to include in the blacklist or whitelist entry. The available options are: SMTP, POP, IMAP, XMPP and Disable greylisting. (Disabling greylisting is only available when whitelisting an IP address, and, if checked, the whitelisted IP will not be greylisted.
  • Description - Use this field to enter optional notes for understanding the various whitelist / blacklist entries.

Note: SmarterMail runs a check against the IPs listed in whitelist, blacklist and authentication bypass settings. This check looks at the number of IPs listed and will display a warning if the IPs listed represent a significant number. (E.g., a range greater than a /24.) While the warning does not affect the ability to save the settings, it is an indication that the administrator may want to review the settings prior to adding the IP range.