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Hi, 
I want to install/create an SPF record for my domain -- let's see it mydomain.com. I also have another domain on that mail server, let's call it mydomain2.com. &nbsp; 
I'm noticing that some mail from outside hosts(outlook.com) &nbsp;are going directly into my users junkmail folder, and the message in the headers of these say: 
received-spf: None (protection.outlook.com: mydomain.com does not designate permitted sender hosts 
 
I found a wizard out there that creates SPF records but I'm not 100% clear on all of the questions it's asking. 
In particular these three: 
1. Enter any IP addresses in CIDR format for netblocks that originate or relay mail for this domain 
(space separated, for a single IP address use /32, i.e. 192.168.1.14/32) 
&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
2.Enter any other hosts which can send or relay mail for this domain 
(space separated) 
&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
3. Enter hostnames for any remote spf records to include 
(ex. include:_spf.google.com, space separated) 
 
Can someone help me with these questions or point me to a good generic SPF example file. 
 
Last, if I mess up the SPF file and don't put in all the correct data, what's the worst that can happen? &nbsp;Can it cripple my mail server? 
Thanks 
Nacht
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Hi, 
I want to install/create an SPF record for my domain -- let's see it mydomain.com. I also have another domain on that mail server, let's call it mydomain2.com.  
I'm noticing that some mail from outside hosts(outlook.com)  are going directly into my users junkmail folder, and the message in the headers of these say: 
received-spf: None (protection.outlook.com: mydomain.com does not designate permitted sender hosts

I found a wizard out there that creates SPF records but I'm not 100% clear on all of the questions it's asking. 
In particular these three:
1. Enter any IP addresses in CIDR format for netblocks that originate or relay mail for this domain
(space separated, for a single IP address use /32, i.e. 192.168.1.14/32)
 	
2.Enter any other hosts which can send or relay mail for this domain
(space separated)
 	
3. Enter hostnames for any remote spf records to include
(ex. include:_spf.google.com, space separated)

Can someone help me with these questions or point me to a good generic SPF example file. 

Last, if I mess up the SPF file and don't put in all the correct data, what's the worst that can happen?  Can it cripple my mail server? 
Thanks
Nacht

SPF record for Exchange 2010

The Domain Name System (DNS) is a hierarchical, globally distributed system responsible for associating the name of a computer, service or other resource into an IP address for connecting to the Internet or a private network. Most prominently, it translates domain names to the numerical IP addresses needed for the purpose of computer services and devices worldwide.

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.