diff --git a/atst/domain/authnid/utils.py b/atst/domain/authnid/utils.py
index 763820ce..58f04ce4 100644
--- a/atst/domain/authnid/utils.py
+++ b/atst/domain/authnid/utils.py
@@ -1,7 +1,9 @@
 import re
 
+import cryptography.x509 as x509
+from cryptography.hazmat.backends import default_backend
+
 
-# TODO: our sample SDN does not have an email address
 def parse_sdn(sdn):
     try:
         parts = sdn.split(",")
@@ -9,5 +11,21 @@ def parse_sdn(sdn):
         cn = cn_string.split("=")[-1]
         info = cn.split(".")
         return {"last_name": info[0], "first_name": info[1], "dod_id": info[-1]}
+
     except (IndexError, AttributeError):
         raise ValueError("'{}' is not a valid SDN".format(sdn))
+
+
+def email_from_certificate(cert_file):
+    cert = x509.load_pem_x509_certificate(cert_file, default_backend())
+    try:
+        ext = cert.extensions.get_extension_for_class(x509.SubjectAlternativeName)
+        email = ext.value.get_values_for_type(x509.RFC822Name)
+        if email:
+            return email[0]
+
+        else:
+            raise ValueError("No email available for certificate with serial {}".format(cert.serial_number))
+
+    except x509.extensions.ExtensionNotFound:
+        raise ValueError("No subjectAltName available for certificate with serial {}".format(cert.serial_number))
diff --git a/tests/domain/authnid/test_utils.py b/tests/domain/authnid/test_utils.py
index caaa29f9..e72f095b 100644
--- a/tests/domain/authnid/test_utils.py
+++ b/tests/domain/authnid/test_utils.py
@@ -5,12 +5,38 @@ from tests.mocks import DOD_SDN
 
 def test_parse_sdn():
     parsed = utils.parse_sdn(DOD_SDN)
-    assert parsed.get('first_name') == 'ART'
-    assert parsed.get('last_name') == 'GARFUNKEL'
-    assert parsed.get('dod_id') == '5892460358'
+    assert parsed.get("first_name") == "ART"
+    assert parsed.get("last_name") == "GARFUNKEL"
+    assert parsed.get("dod_id") == "5892460358"
+
 
 def test_parse_bad_sdn():
     with pytest.raises(ValueError):
-        utils.parse_sdn('this has nothing to do with anything')
+        utils.parse_sdn("this has nothing to do with anything")
     with pytest.raises(ValueError):
         utils.parse_sdn(None)
+
+
+FIXTURE_EMAIL_ADDRESS = "artgarfunkel@uso.mil"
+
+
+def test_parse_email_cert():
+    cert_file = open("tests/fixtures/{}.crt".format(FIXTURE_EMAIL_ADDRESS), "rb").read()
+    email = utils.email_from_certificate(cert_file)
+    assert email == FIXTURE_EMAIL_ADDRESS
+
+
+def test_parse_cert_with_no_email():
+    cert_file = open("tests/fixtures/no-email.crt", "rb").read()
+    with pytest.raises(ValueError) as excinfo:
+        email = utils.email_from_certificate(cert_file)
+    (message,) = excinfo.value.args
+    assert "email" in message
+
+
+def test_parse_cert_with_no_san():
+    cert_file = open("tests/fixtures/no-san.crt", "rb").read()
+    with pytest.raises(ValueError) as excinfo:
+        email = utils.email_from_certificate(cert_file)
+    (message,) = excinfo.value.args
+    assert "subjectAltName" in message
diff --git a/tests/fixtures/artgarfunkel@uso.mil.crt b/tests/fixtures/artgarfunkel@uso.mil.crt
new file mode 100644
index 00000000..ab9d0c92
--- /dev/null
+++ b/tests/fixtures/artgarfunkel@uso.mil.crt
@@ -0,0 +1,29 @@
+-----BEGIN CERTIFICATE-----
+MIIE8DCCAtigAwIBAgIJALTstfJQuulmMA0GCSqGSIb3DQEBCwUAMCUxIzAhBgNV
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+wM+BoGmfKP7uq0GBfu/HengJEGk=
+-----END CERTIFICATE-----
diff --git a/tests/fixtures/no-email.crt b/tests/fixtures/no-email.crt
new file mode 100644
index 00000000..645ea845
--- /dev/null
+++ b/tests/fixtures/no-email.crt
@@ -0,0 +1,29 @@
+-----BEGIN CERTIFICATE-----
+MIIE6TCCAtGgAwIBAgIJAKlkkD2Xt+vWMA0GCSqGSIb3DQEBCwUAMCUxIzAhBgNV
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+7ZFG54OsGWYdg8uNNg==
+-----END CERTIFICATE-----
diff --git a/tests/fixtures/no-san.crt b/tests/fixtures/no-san.crt
new file mode 100644
index 00000000..584e1135
--- /dev/null
+++ b/tests/fixtures/no-san.crt
@@ -0,0 +1,31 @@
+-----BEGIN CERTIFICATE-----
+MIIFVTCCAz2gAwIBAgIJAJRtzRX0VhJJMA0GCSqGSIb3DQEBCwUAMCUxIzAhBgNV
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+-----END CERTIFICATE-----