How do I protect my list from email viruses?
The Listserv server runs ClamAV anti-virus, but
anyone reading email with a Windows mail client should be
using (and regularly updating) anti-virus software on their PC.
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
See the FAQ "How do I change the header
settings of my list?" for more information on updating list headers.