Mail Filter Settings

To activate the mail proxy of your LANCOM R&S^®Unified Firewall, navigate to UTM > Email Security > Mail Filter Settings. After you have activated the mail proxy, you can filter e‑mails according to their target address. When these e‑mails are filtered, they will not be forwarded to the recipient and/or mail server.

The Mail Filter Settings configuration dialog allows you to configure the following elements:

Input field	Description
I/0	A slider switch indicates whether the mail proxy is active (I) or inactive (0). Click the slider switch to change the status. This option is deactivated by default.
Filter Mode	Choose the option that contains the desired filter mode. If you selectBlacklist (default), all e‑mails contained in the blacklist (see below) will not be forwarded to the mail server. If you select Whitelists, only whitelist addresses (see below) will be forwarded to the mail server.
Action	Select the button with the action you wish to be applied to the filtered e‑mails. While Reject emails (default) rejects e‑mails using an RFC-compliant answer, Delete emails discards unwanted e‑mails and makes the sender believe that the e‑mail was forwarded to the mail server. Important: The Delete emails option is NOT RFC-compliant. A faulty configuration may cause important e‑mails to be deleted.
Blacklist/Whitelists	According to on the selected filter mode, you can add as many e‑mail addresses to a blacklist or whitelist as you like. You can add e‑mail addresses to both lists in the following ways: To add e‑mail addresses manually, enter an e‑mail address into the input field and click Add. Alternatively, click Import to import e‑mail addresses from a text file. By default, the maximum size of an import file is 1 Megabyte. Every line that is not empty adds an entry to the respective list. You can edit or delete individual entries in the list by clicking the corresponding button next to an entry. For more information, see Icons and buttons. To export the entire list of mail filters to your local disk as a text file, click Export below the list. Note: In every address list, you can add the following placeholders: * for words, ? for single characters.

If you have modified these settings, use the buttons at the bottom right of the editor panel to confirm (Save) or to discard your changes (Reset). Otherwise, you can close the dialog (Close).

Click Activate in the toolbar at the top of the desktop to apply your configuration changes.

Important:

The other mail filter, antispam and antivirus settings are only active if you activate the mail proxy. For more information, see Antispam Settings and Antivirus Settings.

Important:

If you use SSL inspection in both the mail filter and in firewall rules, you need to add your certification authority to the trust store of your LANCOM R&S^®Unified Firewall and to your client devices.