The local-part postmaster is treated specially—it is case-insensitive, and should be forwarded to the domain email administrator. Technically all other local-parts are case-sensitive, therefore [email protected] and [email protected] specify different mailboxes; however, many organizations treat uppercase and lowercase letters as equivalent. Indeed, RFC 5321 warns that "a host that expects to receive mail SHOULD avoid defining mailboxes where ... the Local-part is case-sensitive".
Nice, easy to follow post Kashish. Not using an email address that represents your domain name is a lost opportunity and one of the most common mistakes that I see online. I mention this quite a bit on my blog but I’ve never created an article like this one before. I’m sending my blog readers her in the comment section of my most recent posts. Thanks! I found this at the perfect time.
A personalised email address on your domain like [email protected] increases the value and perception of the professionality of your business to customers and prospects. While free email services offered by Google, Yahoo, etc. are fine for personal use, a custom email address will prove that you are a professional or legitimate business. If you already have a hosting plan with one.com, your personalised email address comes as part of the hosting package completely free of charge.
Earlier forms of email addresses on other networks than the Internet included other notations, such as that required by X.400, and the UUCP bang path notation, in which the address was given in the form of a sequence of computers through which the message should be relayed. This was widely used for several years, but was superseded by the Internet standards promulgated by the Internet Engineering Task Force (IETF).
For email marketers and email newsletter senders, the email domain will generally correspond with their website. This allows recipients to easily identify who the mail is coming from, or to easily reach the website. In other cases, recipients may be able to use a simple, straightforward email domain to reach a catch all mailbox in the case that they are unsure of their intended recipient’s email prefix. 

Microsoft offers software licenses through a program called the Service Provider License Agreement. The SPLA model provides use of Microsoft products through a monthly user or processor based fee. SPLA software includes the Windows Operating System, Microsoft SQL Server, Microsoft Exchange Server, Microsoft SharePoint and shoutcast hosting, and many other server based products.
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