Did you ever wonder how spammers got your email address? According to new research by the USA-based Center for Democracy and Technology, publication of your email address on a website is the number one cause of getting a lot of spam. It definitely helps to disguise your address, such as replacing 'somebody@domain.eu' with 'somebody at domain dot eu'.

Why am I getting all this spam? (19.03.2003)
http://www.cdt.org/speech/spam/030319spamreport.shtml