I only use this email addy on this site and I have been getting heaps of virus, spam, phishing emails.
The site has been hacked a few times but Theymos swears the hacker could not of gotten the email list, even though they had access to the backend for like 6 months........... Interesting ay.
How come they got your e-mail?
The email addresses must of got leaked if this is the only place you use the email and are getting Bitcoin spam and virus emails.
It is also possible that someone has tried to register with your email address and got an error message saying that your email address is already associated with an account. The attacker would then know that you have an account on bitcointalk.org and that your email is associated with that attack.