Fix #7223: Support sending to smtp server without authentication.

sirepo/smtp.py

@@ -68,11 +68,12 @@ def _send_directly(msg):
             s.send_message(msg)
 
 
-def _send_with_auth(msg):
+def _send_to_configured_smtp_server(msg):
     with smtplib.SMTP(_cfg.server, _cfg.port) as s:
         s.starttls()
         s.ehlo()
-        s.login(_cfg.user, _cfg.password)
+        if _cfg.user and _cfg.password:
+            s.login(_cfg.user, _cfg.password)
         s.send_message(msg)
 
 
@@ -94,14 +95,14 @@ def _init():
         _cfg.server = "not " + _DEV_SMTP_SERVER
         _SEND = _send_directly
         return
-    _SEND = _send_with_auth
+    _SEND = _send_to_configured_smtp_server
     if pkconfig.in_dev_mode():
         if _cfg.server is None:
             _cfg.server = _DEV_SMTP_SERVER
         return
-    if _cfg.server is None or _cfg.user is None or _cfg.password is None:
+    if _cfg.server is None:
         pkconfig.raise_error(
-            f"server={_cfg.server}, user={_cfg.user}, and password={_cfg.password} must be defined",
+            f"server={_cfg.server} must be defined",
         )