Restore default "mailing footer" in civicrm WordPress 4.2.4
You don't have to reset the default to fix this problem.

In your CiviCRM mass mailing, you need to have the following piece of code (tokens) :


{domain.address} which will display the full address of your organization as defined in the menu Administer -> Communications -> Organization Address and Contact Info (https://yourwebsite.org/civicrm/admin/domain?action=update&amp;reset=1)
{action.optOutUrl} or {action.unsubscribeUrl} to allow the contact to unsuscribe to the mailing


Both tokens are a safe-guard which facilitate compliance with the US CAN-SPAM Act. 

You could put the tokens either in the footer / header but you don't have to. You could also add them in your email content.

Also, while not recommended, you could deactivate those verification by checking option Disable check for mandatory tokens in menu Administer -> CiviMail -> CiviMail Component Settings (https://yourwebsite.org/civicrm/admin/setting/preferences/mailing?reset=1)