def METHOD_NAME(self, key, value):
    positions = []
    for email in value:
        if email['original_email'] != email['email']:
            positions.append(
                {
                    'emails': [email['email']],
                    'old_emails': [email['original_email']],
                }
            )
    if 'positions' in self:
        self['positions'].extend(positions)
    else:
        self['positions'] = positions
    raise IgnoreKey