HTML entity encoding (convert '<' to '<') on iPhone in objective-c

Question

I\'m developing an application for the iPhone that has inApp-mail sending capabilities. So far so good, but now I want to avoid html-injections as some parts of the mail are

Answer 1

Assuming the character encoding of the email supports Unicode - say UTF-8 - could you not just find and replace the occurrences of <, >, and & with <, >, and &?