According to security firm Sophos, millions of emails carrying the usual spam or malware are expected to hit inboxes around the world. While the messages might seem harmless love emails, they actually are meant to either deliver the infected attachment or lure the unsuspecting visitor to a malicious website.

"The technique of using the disguise of love isn’t a new one – in 2000 the Love Bug virus posed as a romantic loveletter and millions of users around the world were hit. But every year we see more attempts by hackers to make what should be a day of romance a misery," said Graham Cluley, senior technology consultant at Sophos. "All companies and organizations should teach employees safe computing practice and to be suspicious of any unsolicited emails. Clicking on an unknown file or weblink is asking for trouble."

For instance, the firm stressed out, a recent email campaign aims to lure user to a website designed to infect and take control over PCs so they can be used later to send further spam, launch denial-of-service attacks, or commit identity theft.

The campaign uses emails with subject lines such as "I Like You", "Powerful Love", "Tower of Love", "You Stay In My Heart", "Hugs And Kisses", "Val-ANT-ines", "Just You", "What is Love?", "The Love Train", "My Heart", "You’re My Valentine", "Just You", "My Love For You", "Love Rose", "World Love", "You Stay In My Heart", "A Rose To Say…", "I Love You", "Valentine Friends", "Love Rose", "Thinking Of U All Day", "Valentine Invitation", and "Happy Valentine’s Day!"