if (isset($full_name)) setPref($data_dir, $username, 'full_name', $full_name);
if (isset($email_address)) setPref($data_dir, $username, 'email_address', $email_address);
if (isset($reply_to)) setPref($data_dir, $username, 'reply_to', $reply_to);
if (isset($full_name)) setPref($data_dir, $username, 'full_name', $full_name);
if (isset($email_address)) setPref($data_dir, $username, 'email_address', $email_address);
if (isset($reply_to)) setPref($data_dir, $username, 'reply_to', $reply_to);