[IMP] mail: cache all mail-related config parameters in one query

addons/mail/models/__init__.py

@@ -1,5 +1,6 @@
 # -*- coding: utf-8 -*-
 
+from . import ir_config_parameter
 from . import mail_message_subtype
 from . import mail_tracking_value
 from . import mail_alias

addons/mail/models/ir_config_parameter.py

@@ -0,0 +1,29 @@
+# -*- coding: utf-8 -*-
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+from odoo import api, models
+from odoo.tools import ormcache
+
+
+class IrConfigParameter(models.Model):
+    _name = 'ir.config_parameter'
+    _inherit = 'ir.config_parameter'
+
+    _KEYS = ('mail.catchall.alias',
+             'mail.catchall.domain',
+             'mail.bounce.alias',
+             'mail.session.batch.size',
+             'mail.batch_size',
+             'web.base.url')
+
+    @api.model
+    def get_param(self, key, default=False):
+        if key in self._KEYS:
+            return self._get_mail_params().get(key, default)
+        return super(IrConfigParameter, self).get_param(key, default=default)
+
+    @ormcache('self.env.uid')
+    def _get_mail_params(self):
+        params = self.env['ir.config_parameter'].search_read([
+            ('key', 'in', self._KEYS)], fields=['key', 'value'])
+        return dict((param['key'], param['value']) for param in params)