[FIX] mail: remove unused route

The route is no longer used but was still present in the code.
Processing email should be the job of the fetchmail server and they
should not be injected directly from outside (even if emails are
unauthenticated by design, mail servers may still have some say in the
process).

Courtesy of Alexandre Díaz

closes odoo/odoo#50053

Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>

addons/mail/controllers/main.py

@@ -98,21 +98,6 @@ class MailController(http.Controller):
         url = '/web?#%s' % url_encode(url_params)
         return werkzeug.utils.redirect(url)
 
-    @http.route('/mail/receive', type='json', auth='none')
-    def receive(self, req):
-        """ End-point to receive mail from an external SMTP server. """
-        dbs = req.jsonrequest.get('databases')
-        for db in dbs:
-            message = base64.b64decode(dbs[db])
-            try:
-                db_registry = registry(db)
-                with db_registry.cursor() as cr:
-                    env = api.Environment(cr, SUPERUSER_ID, {})
-                    env['mail.thread'].message_process(None, message)
-            except psycopg2.Error:
-                pass
-        return True
-
     @http.route('/mail/read_followers', type='json', auth='user')
     def read_followers(self, follower_ids, res_model):
         followers = []