From f77f202b6544cb19c0b7e37634e44a8ebcf2df11 Mon Sep 17 00:00:00 2001
From: Kieran Jacobsen <kieran@kjacobsen.net>
Date: Thu, 3 May 2018 22:54:19 +1000
Subject: [PATCH] Add support for "exists" element in SPF. (#356)

* Include support for "exists" element in SPF.
* Add exists: SPF entry to test support
---
 pkg/spflib/parse.go      | 2 ++
 pkg/spflib/parse_test.go | 1 +
 2 files changed, 3 insertions(+)

diff --git a/pkg/spflib/parse.go b/pkg/spflib/parse.go
index c6441e8be..2f42ad98f 100644
--- a/pkg/spflib/parse.go
+++ b/pkg/spflib/parse.go
@@ -79,6 +79,8 @@ func Parse(text string, dnsres Resolver) (*SPFRecord, error) {
 					return nil, errors.Errorf("In included spf: %s", err)
 				}
 			}
+		} else if strings.HasPrefix(part, "exists:") {
+			p.IsLookup = true
 		} else {
 			return nil, errors.Errorf("Unsupported spf part %s", part)
 		}
diff --git a/pkg/spflib/parse_test.go b/pkg/spflib/parse_test.go
index 53a07f9b7..3dee50ea1 100644
--- a/pkg/spflib/parse_test.go
+++ b/pkg/spflib/parse_test.go
@@ -20,6 +20,7 @@ func TestParse(t *testing.T) {
 		"include:servers.mcsv.net",
 		"include:sendgrid.net",
 		"include:spf.mtasv.net",
+		"exists:%{i}._spf.sparkpostmail.com",
 		"~all"}, " "), dnsres)
 	if err != nil {
 		t.Fatal(err)