How to include multiple domains in an spf TXT Record

Question

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?

can anyone tell me what this ?all mean, sometimes they have this sign ~all — Tanvir, Apr 18 '18 at 12:15

score 338 · Accepted Answer · edited Apr 13 '17 at 12:14

338

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.

edited Apr 13 '17 at 12:14

Community

1

answered Jun 22 '11 at 18:15

Shane Madden

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[RFC 4408 §10.1](http://tools.ietf.org/html/rfc4408.html#section-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
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@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
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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 http://www.kitterman.com/spf/validate.html and it said it was valid. – k1DBLITZ Feb 03 '15 at 18:20
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@k1DBLITZ Yes, that's valid - `include` is just for when you're using records from another domain. – Shane Madden Feb 03 '15 at 18:21
can anyone tell me what this ?all mean, sometimes they have this sign ~all – Tanvir Apr 18 '18 at 12:15
`+all pass Allow all mail` `-all fail Only allow mail that matches one of the parameters (IPv4, MX, etc) in the record` `~all softfail Allow mail whether or not it matches the parameters in the record` `?all neutral No policy statement` – tvirelli May 18 '18 at 17:19
There is also [a limit of 255 characters](https://kb.isc.org/article/AA-00356/0/Can-I-have-a-TXT-or-SPF-record-longer-than-255-characters.html) for an SPF record. – Uwe Keim May 24 '18 at 13:32

score 0 · Answer 2 · answered Mar 30 '22 at 04:24

You can do this with spacing but use a tool to verify the 10 DNS lookup limit has not been breached. You cannot have multiple SPF records either so you may need to be brutal with the shortlist.

As an aside, you do not need a:foo.com if you have include:foo.com in the same string. If this is is a fallacious remark, please comment below.

score -1 · Answer 3 · edited Jun 01 '18 at 04:51

-1

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

v=spf1 include:spf.messagelabs.com include:_netblocks.eloqua.com ~all

edited Jun 01 '18 at 04:51

JorgeM

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answered Jun 22 '11 at 18:15

user48838

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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 07 '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 06:09
It's as the OP was looking for in a - "spf record that has 2 included domains..." – user48838 Mar 10 '14 at 06:17
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Okay, I thought you meant one include statement like "include:spf.messagelabs.com,include:ibm.com" – flickerfly Mar 10 '14 at 12:10

How to include multiple domains in an spf TXT Record

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