Your Email Online Virus Prevention Tips Do not open an files attached to an e-mail from an unknown, suspicious or untrustworthy source. Do not open any files attached to an e-mail unless you know what it is, even if it appears to come from a dear friend or someone you know.
Some viruses can replicate themselves and spread through e-mail.
Better safe than sorry and confirm they really sent it. Do not open any files attached to an e-mail if the subject line is questionable or unexpected. Do not forward or reply to any of them. These types of e-mail are considered spam, which is unsolicited, intrusive mail that clogs up the network. Do not download any files from strangers.