A recent study indicates they are!

In an article for online eWeek Enterprise News and Reviews, Study: Spam Filters Often Looses E-Mails, columnist Anick Jesdanun wrote,

As spam-fighting tools become increasingly aggressive, e-mail recipients risk losing newsletters and promotions they've requested.

A new study attempts to quantify missed bulk mailings. Return Path, a company that monitors e-mail performance for online marketers, found that nearly 19 percent of e-mail sent by its customers never reached the inboxes of intended recipients.

This study was conducted by Return Path, a email research firm and provider of various email performance services at both the corporate and personal levels. According to the article, the study included eighteen major ISPs and one hundred Return Path customers. The period of the study was the last half of 2003, and they estimated that this loss of email was up nearly 4% over the same time period for 2002. The article went on to say,

In some cases, the messages weren't delivered at all; in other cases, messages wound up in spam folders that are rarely checked. Though technical glitches can also cause mail to disappear, Return Path blames most of the deletions on spam filters.

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