old_contents: # -*- coding: utf-8 -*-
  import re
  from openerp import SUPERUSER_ID
  from openerp.osv import fields, osv
  
  import logging
  _logger = logging.getLogger(__name__)
  
  class mail_mail(osv.osv):
      _inherit = "mail.mail"
  
      def send(self, cr, uid, ids, context=None, **kwargs):
          catchall_alias = self.pool['ir.config_parameter'].get_param(cr, uid, "mail.catchall.alias_from", context=context)
          catchall_domain = self.pool['ir.config_parameter'].get_param(cr, uid, "mail.catchall.domain", context=context)
  
          correct_email_from = '@%s>?\s*$'%catchall_domain
          default_email_from = '%s@%s' % (catchall_alias, catchall_domain)
  
  
          for mail in self.browse(cr, SUPERUSER_ID, ids, context=context):
              email_from = mail.email_from
              if not email_from or re.search(correct_email_from, email_from) is None:
                  mail.email_from = default_email_from
          return super(mail_mail, self).send(cr, uid, ids, context=context, **kwargs)
  
new_contents: # -*- coding: utf-8 -*-
  import re
  from openerp import SUPERUSER_ID
  from openerp.osv import fields, osv
  
  import logging
  _logger = logging.getLogger(__name__)
  
  class mail_mail(osv.osv):
      _inherit = "mail.mail"
  
      def send(self, cr, uid, ids, context=None, **kwargs):
          catchall_alias = self.pool['ir.config_parameter'].get_param(cr, uid, "mail.catchall.alias_from", context=context)
          catchall_domain = self.pool['ir.config_parameter'].get_param(cr, uid, "mail.catchall.domain", context=context)
  
          correct_email_from = '@%s>?\s*$'%catchall_domain
          default_email_from = '%s@%s' % (catchall_alias, catchall_domain)
  
  
          for mail in self.browse(cr, SUPERUSER_ID, ids, context=context):
              email_from = mail.email_from
              if not email_from or re.search(correct_email_from, email_from) is None:
                  mail.write({'email_from': default_email_from})
          return super(mail_mail, self).send(cr, uid, ids, context=context, **kwargs)
  
subject: use v7 style write