This is why. From Postini:
Virus Report – See The Graph below
In July, our Postini datacenters saw the biggest volume of email virus attacks so far in 2008, with a peak of nearly 10 million messages on July 24. One of the more prominent attacks in the month involved a spoofed UPS package-tracking link that was intended to lure recipients into clicking on it and downloading malware. Our zero-hour virus protection technology first started catching these emails on July 20.
July Breaks Record in Virus Attacks
Spam Levels Remain High: April showed peak spam volumes for 2008, but the overall level of spam remains high this summer. The average user has received 133 spam messages per day this year. Our statistics show that the average unprotected user would have received 36,000 spam messages in 2006 and 36,000 in 2007. This year’s July total shows a 68% growth rate over the same time in 2007. In short, spam attacks in 2008 have not let up from previous years.
Viruses tend to increase during the summer months, and August is already showing some new types of viruses. On August 5, we saw a large inflow of messages with an encrypted .RAR attachment. The overall 2008 trend has been a decrease in the use of attachments, so this new virus is confirmation that spam doesn’t follow trends for long.
These examples are also a good reminder about the importance of educating our colleagues, friends, and family on how to safely interact with email — namely, that we should all be careful about clicking on links in emails, even if those messages appear to be from people or organizations we know.

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