Joomla, by default, tries to cloak email address that it finds in content so that spambots searching websites to harvest email addresses can’t find them (side note: Joomla also turns any email addresses it finds into email links).
There are some instances when you might want this turned off.
To turn email cloaking off, just add this code without spaces:
{ emailcloak=off }
to the top of the page in the HTML code (go into HTML code view to do it).