Anti-spam techniques - Wikipedia
Various anti-spam techniques are used to prevent email spam (unsolicited bulk email). No technique is a complete solution to the spam problem, and each has trade-offs ...https://en.wikipedia.org/wiki/Anti-spam...
Free anti-virus software; Freebyte's Guide to
Truly free anti-virus software, free firewalls, free email protection software, free virus prevention software, tests of anti-virus programs, links to specialized ...http://www.freebyte.com/antivirus/
Understanding Anti-Virus Software
Anti-virus software can identify and block many viruses before they can infect your computer. Once you install anti-virus software, it is important to keep it up to date.https://www.us-cert.gov/ncas/tips/ST04-005