Why not just mask it yourself when you type it in? Or ask people to use the private message function of the board?
The most common methods of obfuscating e-mail adresses are completely trivial to defeat. I wouldn't be surprised if all those people who've posted their e-mail addresses as blah[at]whatever.com and think they're so clever aren't all getting a ton of spam in their inboxes every day. Spammers aren't idiots. There's enough money in spamming to make it worth their while to write the tiny bit of code it takes to break the most common obfuscation techniques.
Spelling mistakes, grammatical errors, and stupid comments are intentional.
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