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I am looking to setup a TXT spf record that has 2 included domains... individually:

v=spf1 include:_spf.google.com ~all

and

v=spf1 include:otherdomain.com ~all

What is the proper way of combining them into a single item?

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2 Answers 2

up vote 51 down vote accepted

v=spf1 include:_spf.google.com include:otherdomain.com ~all

There's no restriction against including multiple names in a single entry; Hotmail, for instance, takes this to extremes. Note that multiple includes, or nested ones, need to stay under the limit of 10 total DNS lookups for the whole SPF check.

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2  
RFC 4408 §10.1: SPF implementations MUST limit the number of mechanisms and modifiers that do DNS lookups to at most 10 per SPF check, including any lookups caused by the use of the "include" mechanism or the "redirect" modifier. –  mr.spuratic Feb 26 '14 at 10:48
1  
@mr.spuratic Good point - that was poor wording, as I was trying to say "you can do greater than one." Edited. –  Shane Madden Feb 26 '14 at 17:49
    
Do you have to use the word include each time? Would this be a valid format? (minus the fake domain and internal address space) "v=spf1 include:www.domain.com ip4:10.10.10.0/24 ip4:10.10.100.0/24 a -all" I checked it against kitterman.com/spf/validate.html and it said it was valid. –  k1DBLITZ Feb 3 at 18:20
1  
@k1DBLITZ Yes, that's valid - include is just for when you're using records from another domain. –  Shane Madden Feb 3 at 18:21
    
Good to know, thanks! –  k1DBLITZ Feb 3 at 18:26

It look like you can merge both together into one entry. Lenovo.com appears to be an example of this.

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Their current SPF record is "v=spf1 include:spf.messagelabs.com ~all v=spf1 mx/24 mx:include:ibm.com/24 ~all" Can you explain what you mean? –  flickerfly Mar 7 '14 at 20:12
    
Perform a "nslookup -type=txt lenovo.com" (without the quotes) and it should be self-explanatory. –  user48838 Mar 10 '14 at 6:09
    
It's as the OP was looking for in a - "spf record that has 2 included domains..." –  user48838 Mar 10 '14 at 6:17
    
Okay, I thought you meant one include statement like "include:spf.messagelabs.com,include:ibm.com" –  flickerfly Mar 10 '14 at 12:10

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