Catch Exception?

This should catch the exception...

And log based on that (it won't but maybe I can see better where my
error is).

docs/courier-to-mailman3.md

@@ -31,3 +31,4 @@ This is our current version trying to communicate between courier and mailman3.
 * OK, parsing port number, and setting default.
 * Logging error (I hope), when lmtp fails to be created.
   * Maybe this is better?  
+  * Catch exception, log based on that?

source/courier-to-mailman3.py

@@ -65,7 +65,7 @@ try:
         # 5xx error
         else:
             raise
-except:
+except smtplib.SMTPException as e:
     logger.error('lmtp error')
-    #logger.error('lmtp failed errorno: %s, message: %s', e.errno, e.strerror)
+    logger.error('lmtp failed errorno: %s, message: %s', e.errno, e.strerror)
     exit(100)