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In 3.1.3 it is actually simplier than thought

in index.php find ~line 113

<h3><a href="<?php the_permalink(); ?>"><?php if ( mb_strlen(get_the_title()) >= 75 ) echo mb_substr( get_the_title(),...

You'll find this information here: Show message to the original poster the contact info

1 - Check Settings talk and see if it is marked to receive e-mail. "Send me an email when"
It Could Be That your mail host does not support the PHP mail function and is used by disallowing...