There are some additional things you can do as a list owner, to make sure your list isn't transmitting viruses or malware to your subscribers.

• If your list is Send= Public, change it!
  The only lists that need this setting are helpdesk-type lists, and even then, it may be possible to restrict who can post (contact us for help with this). The suggested settings are Send= Owner (only owner can post) or Send= Private (only subscribers can post).

• The next most effective preventive measure is to use the Attachments= setting in your list header. This feature, which was introduced in May 2000, will cause to Listserv disallow or filter email attachments.
  See the FAQ "How do I configure my list for attachments?" for more information.

• Until the release of the Attachments= feature, the Sizelim= list header was the recommended defense, and is still valuable. This header specifies the maximum number of lines (including mail headers) allowed in a posting. A Sizelim= 250 value will keep many viruses from being distributed by your list.

• A related header, Language= NOHTML, isn't really to guard against viruses, just annoyance. This just affects messages posted with both plain text and HTML versions of the text: it causes the HTML copy of the message to be stripped off.

See the FAQ "How do I change the header settings of my list?" for more information on updating list headers.