Getting unexpected error when trying to validate SPF containing an "exp" modifier

[julienfromentc]

When running the below command:

spf_server = SPF::Server.new
spf_server.process(SPF::Request.new(scope: "mfrom", identity: "example@gatineau.ca", ip_address: "206.123.2.240"))

I am getting the following error:

NoMethodError: undefined method `new' for #<SPF::MacroString:0x0000564e0fca8830>
from /home/user/.rvm/gems/ruby-2.7.4/gems/spf-0.0.54/lib/spf/model.rb:748:in `process'
Caused by SPF::Result::SoftFail: softfail (SPF::Result::SoftFail)
from /home/user/.rvm/gems/ruby-2.7.4/gems/spf-0.0.54/lib/spf/model.rb:1000:in `block in eval'

According the the error, the gem is trying to parse the exp modifier.

I tried to validate the ip address/identity using the spf-check package, and it returned a Pass result, so the issue does not seem to be caused by malformed SPF record.

---

In case the SPF record of the domain gatineau.ca changes, here are the current SPF records:

gatineau.ca     text =
        "v=spf1 include:spf.cyberimpact.com include:shops.shopify.com include:servers.mcsv.net include:outgoing1.vircom.com ip4:192.69.1.7/32 ip4:207.115.110.7/32 ip4:207.115.110.252/32 ip4:64.254.21.171/32 ip4:206.123.2.240/32 -all"

spf.cyberimpact.com     text =
        "v=spf1 ip4:50.56.176.200 ip4:50.56.187.251 ip4:45.61.49.183 ip4:45.61.49.253 ip4:67.212.92.20 ip4:184.149.61.112 ip4:204.154.174.0/23 ~all exp=spfexp.cyberimpact.com"

spfexp.cyberimpact.com  text =
        "Please see http://www.openspf.org/Why?s=mfrom;id=%{S};ip=%{C};r=%{R}"

shops.shopify.com       text =
        "v=spf1 ip4:35.203.94.235 ip4:35.203.3.51 ~all"

servers.mcsv.net        text =
        "v=spf1 ip4:205.201.128.0/20 ip4:198.2.128.0/18 ip4:148.105.8.0/21 -all"

outgoing1.vircom.com    text =
        "v=spf1 a ip4:207.115.110.0/24 ip4:207.115.106.114 ip4:192.69.1.0/24 ip4:207.96.143.7/32 a:outgoing1.vircom.com a:outgoing2.vircom.com -all"