fix: catch autentication exception

--HG--
branch : 3.25

cubicweb/cwconfig.py

@@ -189,7 +189,7 @@ from os.path import (exists, join, expanduser, abspath, normpath,
 import pkgutil
 import pkg_resources
 import re
-from smtplib import SMTP
+from smtplib import SMTP, SMTPAuthenticationError
 import stat
 import sys
 from threading import Lock
@@ -1408,8 +1408,14 @@ the repository',
         try:
             try:
                 smtp = SMTP(server, port)
-                if smtp_user and smtp_password:
-                    smtp.login(smtp_user, smtp_password)
+                try:
+                    if smtp_user and smtp_password:
+                        smtp.login(smtp_user, smtp_password)
+                except SMTPAuthenticationError as exception:
+                    self.exception(
+                        "cannot log in to SMTP server %s:%s (%s)",
+                        server, port, exception
+                    )
             except Exception as ex:
                 self.exception("can't connect to smtp server %s:%s (%s)",
                                server, port, ex)