You can resolve it by editing the the registry.

1. Click Start, click Run, type regedit, and then click OK.
2. In Registry Editor, locate and then click the following registry key:

   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa

3. Right-click Lsa, point to New, and then click DWORD Value.
4. Type DisableLoopbackCheck, and then press ENTER.
5. Right-click DisableLoopbackCheck, and then click Modify.
6. In the Value data box, type 1, and then click OK.
7. Quit Registry Editor, and then restart your computer.

IIS Application Warm-Up for IIS 7.5 enables IT Professionals to improve the responsiveness of their Web sites by loading the Web applications before the first request arrives. By proactively loading and initializing all the dependencies such as database connections, compilation of ASP.NET code, and loading of modules, IT Professionals can ensure their Web sites are responsive at all times even if their Web sites use a custom request pipeline or if the Application Pool is recycled.

The mail was dropped into the IIS bad mail directory, because our server was prohibited from relaying mail by spamhaus.org.
As we were relaying for abracadabra.com, and our mail server was not known as a mail server from this domain we we’re blocked.

We solved it by sending our mail through the mail server which was responsible for the abracadabra.com by using SMTP Authentication.

• Open the [Properties] of your Default SMTP Server
• Click on the [Outbound Security] button

  

  Fill in your user name and password you use for your remote SMTP Server of the abracadabra domain and click [OK]

• Then click the [Advanced] button and fill in your remote SMTP server in the “Smart host” field.

   

  Click [OK] twice

• Open IIS Manager
• Open [Web Server Extensions]
• Check if ASP.NET v1.1.4322 or ASP.NET v2.0.5727 is prohibited to run