A feedback related to a previous one: http://feedback.userecho.com/topic/232682-problem-with-single-quotes-in-e-mail-notifications-subject/
I just noticed that when a topic title contains single quote (as this feedback ;-))
then all the produced e-mail notifications with this title as subject replaces the quote by a numeric code: "& #39;"
(without the space ;-))
This replacement only concerns the e-mail subject. Any single quote in the e-mail body is correctly rendered.
(I observed this by viewing the e-mail in Thunderbird and also in Zimbra web interface for mail)