[Zope] Trapping exceptions

[Tony Middleton]

Sorry if this is a silly question but I've not found anything via Google 
or zope.org.

I am using a MailHost in a Python script.  I need to trap error conditions.

When I run without trapping I can get exception SMTPSenderRefused.

I inserted trapping - eg

   try:
     context.mailman.send(vmessage,mto=vto,mfrom=vfrom,subject='Message 
from web site')
   except SMTPSenderRefused:
     vsenderok=False
   else:
     vsenderok=True

This gave error global name 'SMTPSenderRefused' is not defined

I tried importing smtplib and adding it to the except line and then got 
a permissions problem.

You are not allowed to access SMTPSenderRefused in this context

I'd appreciate any help with this.

Regards

Tony