Add new share buttons

fucntions.php

function new_share_email($share_buttons, $place, $post_id, $buttons){


	$url = get_permalink( $post_id );
	$title = isset( $_post->post_title ) ? $_post->post_title : '';

	$share_buttons[] = array(
						'id' => 'email' ,
						'url' => 'mailto:?subject=I wanted you to see this site&body=' . $title . ' ' . $url,
						'name' => 'Email',
						'title' => 'Share on Facebook',
						'alt_title' => 'Share on Facebook',
						'icon_class' => 'email' ,
						'custom_atts' => '',
						);

	return $share_buttons;
}

add_filter("the7_get_share_buttons_list", "new_share_email", 10, 4);

Then you will have to add necessary CSS to style the button, it will be something like this

.single-share-box .share-buttons a.email{
color: #9d9d9d;
transition: 150ms all ease-in-out;
&:hover {
color: #474747;
}
&:before {
content: "\e001";
}
}