Python 3 preparation: "except" syntax.

Changing "except Exception, var" to "except Exception as var".
Tool-generated patch.

Author: jsm28

roundup/mailer.py

@@ -295,7 +295,7 @@ def smtp_send(self, to, message, sender=None):
             except socket.error as value:
                 raise MessageSendError("Error: couldn't send email: "
                                        "mailhost %s"%value)
-            except smtplib.SMTPException, msg:
+            except smtplib.SMTPException as msg:
                 raise MessageSendError("Error: couldn't send email: %s"%msg)
 
 class SMTPConnection(smtplib.SMTP):