Add a test for a domain without a MX record, with an A record, but with a reject-all SPF record

Author: JoshData

tests/mocked-dns-answers.json

@@ -41,32 +41,53 @@
  },
  {
   "query": {
-   "name": "mail.example",
+   "name": "nellis.af.mil",
    "type": "MX",
    "class": "IN"
   },
   "answer": []
  },
+ {
+  "query": {
+   "name": "nellis.af.mil",
+   "type": "A",
+   "class": "IN"
+  },
+  "answer": [
+   "132.58.234.0"
+  ]
+ },
+ {
+  "query": {
+   "name": "nellis.af.mil",
+   "type": "TXT",
+   "class": "IN"
+  },
+  "answer": [
+   "\"v=spf1 -all\"",
+   "\"MS=ms47108184\""
+  ]
+ },
  {
   "query": {
    "name": "mail.example",
-   "type": "ANY",
+   "type": "MX",
    "class": "IN"
   },
   "answer": []
  },
  {
   "query": {
    "name": "mail.example",
-   "type": "AAAA",
+   "type": "ANY",
    "class": "IN"
   },
   "answer": []
  },
  {
   "query": {
-   "name": "mail.example.com",
-   "type": "MX",
+   "name": "mail.example",
+   "type": "AAAA",
    "class": "IN"
   },
   "answer": []

tests/test_deliverability.py

@@ -31,6 +31,11 @@ def test_deliverability_fails():
     with pytest.raises(EmailUndeliverableError, match='The domain name {} does not accept email'.format(domain)):
         validate_email_deliverability(domain, domain, dns_resolver=RESOLVER)
 
+    # No MX record, A record fallback, reject-all SPF record.
+    domain = 'nellis.af.mil'
+    with pytest.raises(EmailUndeliverableError, match='The domain name {} does not send email'.format(domain)):
+        validate_email_deliverability(domain, domain, dns_resolver=RESOLVER)
+
 
 @pytest.mark.parametrize(
     'email_input',