Less than 5 percent of all e-mail is delivered to mailboxes, as the rest is junk blocked by spam-fighting efforts, according to Enisa, the European Network and Information Security Agency.
The agency reported the finding in a report, published last week, on antispam measures taken by European ISPs in 2009. While these measures are well used by providers, junk e-mail remains a key problem for them and takes up a large part of their annual budgets, according to the report.
ISPs surveyed by the agency said nearly 80 percent of all SMTP connections were aborted, mainly because a match had occurred against a blacklist. Of the connections that were accepted, almost 80 percent were filtered out, mostly as spam, it added in its report.
Read more of "Spam traps catch 95 percent of email sent" at ZDNet UK.