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Web browsers are applications used primarily to display documents, files and media from the Internet, identified by a Uniform Resource Identifier (URI) that can be a page, image, video or other file. Some browsers require the use of add-ons or extensions to safely render the information they receive; others have systems built into them to perform the same functions.
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Here is one of the results I get when I google the error
http://asoke.wordpress.com/2012/01/08/incoming-email-problem-remote-host-said-550-5-1-0-address-rejected/
PS: I fixed your title