On the module's main page, click on the list's icon to bring up the page of option category icons.

Click on Access Control to display a form for editing information and posting restrictions.

The first six fields on the page can be used to restrict access to the get, index, info, intro, which, and who Majordomo commands (explained in the introduction). You may want to do this to hide details of the list from some or all people. In particular, the list of members should not be available to potential attackers.

The fields—named Access to get command and so on—have the following options:

Anyone The command is available to anyone who can send email to the Majordomo address.

List members The command is only available to list members, identified by the From: address of messages to Majordomo.

Nobody Nobody can use the command for this list at all.

The Majordomo lists command usually returns information about all mailing lists on your system.The Include this list in response to lists command for field, however, can be used to limit the senders who will see this particular list, which can be useful if you want to hide it from casual queries. The available choices are:

Everyone The list is visible to anyone who can send email to Majordomo.

Addresses matching regexps Only senders whose addresses match one of the Perl regular expressions entered into the adjacent text box will be able to see the list.

Addresses not matching regexps Only senders whose addresses do not match one of the entered regular expressions will be able to see this list.

To limit posting to list members only, change the Who can post to the list? field to List members. This makes a lot of sense as it protects your list from spammers who have somehow obtained its address.

If only a few people should be allowed to post, create a file containing their email addresses and enter the path into the Addresses in file field. This option is useful for announcement lists on which most subscribers only receive information and cannot post.

To block postings containing certain words or text, use the Taboo body regexps field. All banned words or sentences must be entered one per line with a / at the start and end, such as /smeg/.

It is also possible to block messages whose headers match certain regular expressions by filling in the Taboo header regexps field. For example, you could enter /Subject:.*money.*/ to block all postings with the word money in their subject line.

When you are done on this page, click the Save button. The new restrictions will take effect immediately.