Usage of Security.setProperty("ssl.SocketFactory.provider",myCustomSock...)

Question

While using java mail API, to establish a secure connection with the target server, we use a property object to set any custom socket factory like the following:
props.setProperty( "mail."+ protocol + ".socketFactory.class", "com.realops.adapter.mail.ssl.CustomSSLSocketFactory")
We also set our custom socket factory in the security api like:
Security.setProperty( "ssl.SocketFactory.provider", "com.realops.adapter.mail.ssl.CustomSSLSocketFactory");
Just wanted to know the difference b/w these two lines.
We pass the properties object while creating a javamail session. So it will pick the custom socket factory from the properties object, in this case do we still need to set the custom socket factory in the Security API?
Thanks.

Answer 1

Thanks for the answer.
Can you please also tell me how Security.addProvider(new com.sun.net.ssl.internal.ssl.Provider()) is functionally different from Security.setProperty( "ssl.SocketFactory.provider",...).
Do we always need to 'add' the provider if we are using the Sun's default socket factory or can we simple use local properties object for setting the sun's default socket factory also (assuming it is to be used by java mail only)?
Should I post a separate thread for this?
Much Thanks.