searching for a program / tool that can show you screenshot how your html page show in big mail servers

i search for tool / program that i can upload my html (newsletter), and the program can show me screenshot or in other way

how my newsletter seems in GMAIL / YAHOO / HOTMAIL / 开发者_如何学GoOUTLOOK .. the big mail servers ,

it saves for me , the need to open an account in every provider. and check in every mail how it seems .

thanks

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http://litmusapp.com/