Adding IDNA failure handling

CHANGELOG.txt

@@ -1,3 +1,6 @@
+0.1.11:
+- Handling IDNA errors
+
 0.1.10:
 - Handling the NoNameservers exception
 

setup.py

@@ -26,7 +26,7 @@ class PostBuildPyCommand(build_py):
 
 setup(
     name='py3-validate-email',
-    version='0.1.10',
+    version='0.1.11',
     packages=find_packages(exclude=['tests']),
     install_requires=['dnspython>=1.16.0', 'idna>=2.8'],
     author='László Károlyi',

tests/test_mx_check.py

@@ -55,6 +55,7 @@ class IdnaTestCase(TestCase):
             second='email@address.com')
 
 
+
 class GetMxRecordsTestCase(TestCase):
     'Testing `_get_mx_records`.'
 
@@ -100,3 +101,8 @@ class GetMxRecordsTestCase(TestCase):
             _get_mx_records(domain='testdomain3', timeout=10)
         self.assertEqual(
             exc.exception.args[0], 'testdomain3 DNS resolve timed out')
+
+    def test_returns_false_on_idna_failure(self):
+        'Returns `False` on IDNA failure.'
+        self.assertFalse(expr=mx_module.mx_check(
+            email_address='test@♥web.de', from_address='mail@example.com'))

validate_email/mx_check.py

@@ -9,7 +9,7 @@ from dns.rdatatype import MX as rdtype_mx
 from dns.rdtypes.ANY.MX import MX
 from dns.resolver import (
     NXDOMAIN, YXDOMAIN, Answer, NoAnswer, NoNameservers, query)
-from idna.core import encode
+from idna.core import encode, IDNAError
 
 from .constants import EMAIL_EXTRACT_HOST_REGEX, HOST_REGEX
 
@@ -106,7 +106,10 @@ def mx_check(
     """
     host = helo_host or gethostname()
     idna_from = _get_idna_address(email_address=from_address or email_address)
-    idna_to = _get_idna_address(email_address=email_address)
+    try:
+        idna_to = _get_idna_address(email_address=email_address)
+    except IDNAError:
+        return False
     _user, domain = _dissect_email(email_address=email_address)
     try:
         mx_records = _get_mx_records(domain=domain, timeout=dns_timeout)