In case you are using the transparent mode of WEB Proxy, you must also enable a packet filter rule that allows outgoing HTTPS traffic. Of course, if you register the web proxy into your web browser configuration you don't need that rule, but in such case you have to make sure that HTTPS traffic is allowed by your web proxy configuration.
In network securty / packet filter / I created a new rule sorce-any service https and destination any . Action allow .
And all the emails sites are opening now
