When I start Opera, I see that opera mail and rss starts up automatically. And update itself. I have slow Internet connection. To use opera (nicely) I have to wait for that (unnecessary) update to over. Please suggest me a way to stop this update at startup.
(Since you refer to Opera's mail client I assume you are using Opera 12.xx)
There is no way to disable mail check at startup without disabling the check for new mails in general. If you wish to disable automatic mail check at all (not only at startup), you can do the following: