Real world experience: I contributed some code to VNC many years ago (like 1998 or something) and my unobfuscated email address ended up in the standard
readme.txt that was distributed and installed with every copy of VNC. Back then (and in the following years) there were certainly some spam worms that looked through all files on the user's computer for email addresses. My address was one of those, as well as all the others listed in that file. I get a lot of spam. At one point, some 20% of the total spam I got was "from" a forged address in that same
So the answer is yes, releasing your email address in public software results in more spam. However, many kinds of other things also result in more spam too, so I don't think it's actually worth worrying about. I still use the same email address I've used since 1996, and rely on multiple layers of spam filters to filter out the crap.