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Squinky is correct, there is no &quot;reverse&quot; spf record. &nbsp;<br />
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You can include their domain name like the example Squinky has, or if they have specific IP address you can include those IP addresses<br />
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Including the domain name requires that all of the IP addresses they use to send e-mail have PTR records setup properly.
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Squinky is correct, there is no "reverse" spf record.  

You can include their domain name like the example Squinky has, or if they have specific IP address you can include those IP addresses

Including the domain name requires that all of the IP addresses they use to send e-mail have PTR records setup properly.

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An external company has asked me to create reverse spf so that they can send on behalf of our domain. <br />
&nbsp; <br />
How do I action this? I know this is created on our domain's external DNS however, I am keen to understand the correct syntax.<br />
&nbsp; <br />
Please note they have supplied multiple IP address that they could be sending from if that makes any difference?
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An external company has asked me to create reverse spf so that they can send on behalf of our domain. 
  
How do I action this? I know this is created on our domain's external DNS however, I am keen to understand the correct syntax.
  
Please note they have supplied multiple IP address that they could be sending from if that makes any difference?

How to create reverse spf and the correct syntax

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

Networking is the process of connecting computing devices, peripherals and terminals together through a system that uses wiring, cabling or radio waves that enable their users to communicate, share information and interact over distances. Often associated are issues regarding operating systems, hardware and equipment, cloud and virtual networking, protocols, architecture, storage and management.