Add ConnectionError handling

CHANGELOG.txt

@@ -1,3 +1,6 @@
+1.0.11:
+- Treat connection related errors as ambiguous (e.g. "Connection reset by peer").
+
 1.0.10:
 - First pypi-free release (they removed everything between 1.0.6 and 1.0.9).
 - Removing unnecessary files from the source tarball.

setup.py

@@ -57,7 +57,7 @@ class BuildPyCommand(build_py):
 
 setup(
     name='py3-validate-email',
-    version='1.0.10',
+    version='1.0.11',
     packages=find_packages(exclude=['tests']),
     install_requires=[
         'dnspython~=2.2', 'idna~=3.3', 'filelock~=3.7',

validate_email/smtp_check.py

@@ -175,7 +175,7 @@ class _SMTPChecker(SMTP):
             return False
         except SMTPResponseException as exc:
             return self._handle_smtpresponseexception(exc=exc)
-        except TLSNegotiationError as exc:
+        except (TLSNegotiationError, ConnectionError) as exc:
             self.__temporary_errors[self._host] = SMTPMessage(
                 command=self.__command, code=-1, text=str(exc),
                 exceptions=exc.args)