Spam keeps flooding the mailboxes of email users around the globe, but U.S. email users are apparently less bothered by it according to a new study from the Pew Internet and American Life Project released on Wednesday.

Despite 37% of email users surveyed said spam had increased in their personal email accounts, reporting the highest volume of spam ever, only 18% say spam is a big problem, compared with 25% in June 2003; mostly because users and filter technologies are becoming more sophisticated about handling spam. Other interesting findings show a significant drop in the level of pornographic e-mail.

The telephone survey was conducted from February 15 to March 7 among 1,492 U.S. adult Internet users and has a margin error of plus or minus 3 percentage points. You can check the complete report for other interesting findings.