I would recommend everyone to create separate email for their open-source work. After ten years on SourceForge, Google Code and now Github I get 200 spam messages a day.
Definitely. When I first started programming I felt weirdly happy about getting spam related to github (because it meant at least one other person thought I was a 'real' programmer), but quickly that turns into annoyance at having such a cluttered inbox.
The spam source of my inbox are open source DLs because apparently they are based on either google groups or mailman and they almost always require registration. sigh