The survey targeted email service providers of different types and sizes, and received replies from 100 respondents from 30 different countries, throughout the EU (26/27 EU Member States); and 80 million mailboxes managed. The survey analyses how e-mail service providers combat spam in their networks, and identifies the state of art in the fight against spam.
Some of the key findings are:
- Less than 5% of all email traffic is delivered to mailboxes. This means the main bulk of mails, 95%, is spam. This is a very minor change, from 6%, in earlier ENISA reports.
- 70% of respondents consider spam extremely significant or significant for their security operations.
- Over 25% of respondents had spam accounting for >10% of helpdesk calls.
- Among very small providers, 1/4 of respondents allocate anti-spam budgets of over EUR Ä10,000 per year.
- 1/3 of very large providers dedicate anti-spam budgets >EUR 1 Mn/year.
- Fighting spam has reached a certain level of maturity.
- ISPs are using various kinds of measures: technical, awareness, policies and legal framework. Blacklists are the most commonly used anti-spam tool. On average 5 kinds of measures are used.
- ISPs consider spam prevention as a competitive advantage to attract and retain customers. However, spam is not a critical factor.