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A Mail Exchanger (MX) record is a resource record that allows servers to locate other servers to deliver Internet e-mail using the Simple Mail Transfer Protocol (SMTP). An MX record identifies the SMTP server that will accept inbound messages for a specific DNS domain. Each MX record contains a host name and a preference value. When you deploy multiple SMTP servers that are accessible from the Internet, you can assign equal preference values to each MX record to enable round-robin between the SMTP servers. You also can specify a lower preference value for one of the MX records. All messages are routed through the SMTP server that has the lower-preference-value MX record, unless that server is not available. Here is an example of an MX record:

And here s a listing of the code that is in the edit pane of EffectEdit:

void __Render__control1(HtmlTextWriter __w, Control parameterContainer) { int currentPart = 0; foreach ( ch in this.ViewData.Model.s) { if (ch.PartNo > currentPart) { if (currentPart > 0) { __w.Write("\r\n </ul>\r\n"); } currentPart = ch.PartNo; __w.Write(" \r\n \r\n <h3>Part "); __w.Write(ch.PartNo ); __w.Write("</h3>\r\n <hr />\r\n <ul>\r\n"); } ... } }

More information about MX records and how they are used for SMTP message routing can be found in 5, Routing and Transport.

Exchange Server 2010 uses Sender Policy Framework (SPF) records to support Sender ID spam filtering. If you want to use this feature, you need to configure the SPF records in DNS. This is described in more detail in 7, Edge Transport and Messaging Security.

Split DNS or split-brain DNS is about setting up separate DNS zones so that DNS requests that come from the Internet will resolve to different IP addresses than requests coming from your internal workstations or servers. In other words, as shown in Figure 3-1, if the Internet client resolves mail.litware.com, it will receive an IP address that is associated with an external firewall solution that is sitting in the perimeter network. The internal client will get an IP address associated with the internal Client Access server array.

1

The benefit of using split DNS is that it helps control client access. Internal clients use the internal systems instead of the external systems. In other words, internal users sessions aren t handled by the firewall application and you do not expose internal IP addresses or host names to the Internet. You can also limit access to specific hosts that are part of the perimeter network or force users to take a specific communication route. For this reason it is a best practice to implement split DNS in every Exchange organization that has server roles exposed to the Internet.

It s important to know whether your company has an Internet provider that provides your company with fixed IP addresses or if you re using dynamic IP addresses to access the Internet. If your servers that have some relationship to external communication, such as Edge Transport servers, have fixed IP addresses and your DNS entries (MX or A records) are registered accordingly, you re working with the best practices approach. However, a fixed IP address might be a cost issue, especially in small companies. Thus some companies might want to implement Exchange 2010 based on an Internet provider that only provides a dynamic IP address. If you re in this situation, you should consider a Dynamic DNS service that lets you register your dynamic IP address to their DNS service. However, make sure the dynamic DNS service includes the following:

Any Web requests that come along are processed to generate an HTML page. All server efforts to process the request are aimed at getting an HTML page, from the opening <html> tag to the closing </html> tag. Any code and processing required along the way are overshadowed by the necessity of producing detailed HTML. The link between the Web request and some server-side operation is surely not lost, but it doesn t always show up clearly at the developer level. For years, this remained the major difference between classic ASP (and, later, ASP.NET) and JSP. This gap is covered today with the release of an alternative programming model for the ASP.NET platform. Welcome, ASP.NET MVC! Note You might have noticed that I didn t mention Personal Home Page (PHP) language when