So this subject sort of comes up a lot in the Artists/Writers Wanted section. I just wanted to give out some suggestions on how to stop emails from being posted.
1) Maybe censoring the @ symbol. I know this wouldn't censor the whole word but you can set it to PLZ READ RULES NO EMAIL ADDRESSES @ymail PLZ READ RULES NO EMAIL ADDRESSES, @g, @y, @h, gmail, ymail, hotmail. If they are seriously determined to get their email in then you could have "posting your emails" topic at the front page telling people that it is not allowed but through PMs. I realize it will make PMs a bit harder to share but they can probably space out every single letter or just use PMs more often
2) Simply renaming or adding a sticky in the Artists/Writers Wanted section as "No emails allowed, reasons why" or "Don't post emails, reasons why" I know people are skipping the "What should NOT to post - reading this might save time yours and ours" because if they didn't then emails wouldn't be posted but having a sticky named "No emails allowed, reasons why" will show up even if the person doesn't click the link. Also a different colored highlight will pop up more in all the red highlighted stickies.
Again, I know these can't really solve the problem but they probably will help a little XD