If you have your own email server like me, you may need to know something about SPF record.
From the SPF website, I got the following description:
SPF fights return-path address forgery and makes it easier to identify spoofs.
Domain owners identify sending mail servers in DNS.
SMTP receivers verify the envelope sender address against this information, and can distinguish authentic messages from forgeries before any message data is transmitted.
Use DNS Stuff‘s DNS report tool, you can see if your email server has a SPF record.
To add a SPF record in Windows server.
I go to http://www.michaelbrumm.com/spfwindowsdns/
Update: The site with mentioned link is offline. Here is an archive page.
Follow the instruction to setup my DNS server in Windows 2003
I changed my site’s DNS setting through 1and1 yesterday. The site can not be reached about 1 day average. The same situation I met almost two or three times a year.
I browse my site properly last night. I use Shaw Cable at home. They always update their DNS server very quickly.
The problem is Telus. I have nothing to do in my office this morning, which use Telus.
Telus’s DNS server still has my old IP address.
How to access my site?
I changed TCP/IP setting in my workstation.
Firstly, get the IP address of DNS server from my home computer.
Click Run, enter command to get the command prompt.
Enter ipconfig/all, records the IP address of DNS Servers.
Secondly, go to my office PC, in TCP/IP properties, enter the IP address I got above into the preferred DNS server.
Now I can use the Shaw’s DNS server through Telus Internet connection.