none.plain and simple
You cannot block sites on Gmail as it is not a browser. You can block sites on browser. Gmail itself is a website running on browser.
Now here is what i think of shelterbelt, I'm a student in the southern US, and there are allot of things that do deserve to be blocked, say, pornography websites and gamesites that show gore and nudity, not to mention bad language. but lets say... Youtube! Youtube dos have a few things that deserves to be blocked, but all videos there have there own port, just close the ports that are not student or child friendly, Youtube dos have many things that they can share with us, but yes, yes, some most don't want children to see, lol. I mean, its a miracle that Wiki hasn't been blocked for me! But here is one reason for shelterbelt, the things that are posted on the Internet come from one source, that means that it came from somewhere in the world (or other world if you believe in space creatures and that stuff.). So i do think shelterbelt dos block a little much, but what if we didn't put that inappropriate crap on the Internet? then there would be no need for it, so if your reading this right now... blame this on humanity's sick instincts to post themselves naked on the Internet. From, CMC
Yes, Apple does offer web settings that will help to block Phishing sites.
Go to your security settings, Go to restricted sites and type in the site and it will block the site. Hopes this helps.
Mary Ann Seitz has written: 'Shelterbelt'
You can block gambling sites by installing a web filter on your computer. Alternatively, you can set up parental control to block these websites on certain types of Internet security software.
To block inappropriate and or un-educationally web sites that shall not be seen by the students. Well i don't agree with this, because all that this is doing is making our intrest in School go down the drain. If they block the sites that are fun AND edjucational, then school becomes boring and all intrist fades away until there is no intrist to be in school. I say that they shouldn't block sites.
If your computer has a block on some websites for like myspace and things like that...go to www.vtunnel.com and then change the http forum to https okay?!
Anything they want
jatekok.oldal.info it is foreign
It helps block many adult sites
I'm not exactly sure what your question is but in the US schools have the right to block any websites that they choose to block.