I very rarely conduct forum business outside of forum PMs. If "I" do, you should ask me to PGP-sign my messages.
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.
Go reread the emails I sent out after those incidents and you'll see that I told people to assume that their email addresses
were compromised.
However, since no one has ever published any accurate data from the forum's database, I tend to think that the attackers did not download large chunks of the forum's database, or at least they didn't share this data. For example, as far as I know, no one has ever published a list of Satoshi's IP addresses as used on the forum or his password hash. There have been very few cases of people complaining of increased spam on their forum email addresses, so I believe that these cases are actually unrelated to the forum (even if you think that your email address was unused anywhere else).