Plugin Postie: Formatting punctuation issues

I’m using WP2.5 and Postie 1.1.1, when Postie is sent an email with certain punctuation, say quotation marks, they get all messed up. “Hello” would turn into 1Hello2, where 1&2 are superscripts.

Anyone know if this is a Postie or WP issue or know how to resolve it?

Thanks!