[Zope] Email address validator?

[Bruce Eckel]

>Bruce Eckel wrote:
>
>>Thanks! I spent a bit of time refactoring it. Also, I decided that if it
>worked it would return the address, otherwise it would return None to
>indicate failure.
>>
>[refactored code snipped]
>
>Interesting style!   Thanks!  Always good to learn a new thing or two. 
> Do you plan to work on the other part about querying the SMTP server 
>about whether it accepts mail for [email_address]?
>
>-- Jim Washington

Actually, that part is relatively automatic: when you try to send an email=
 it will throw various types of exceptions, and if there's something wrong=
 with the sender name, you get a SMTPSenderRefused exception. So this code:

        try:
            self.MailHost.send("This is a test", 
              'Bruce@EckelObjects.com', form_data['email'], 
              "%s\n\n" % form_data['seminar-id'])
        except smtplib.SMTPSenderRefused:
            get_transaction().abort()
            return "Invalid email address: please press your browser's=
 'back' key and correct it"

(Or something fancier -- I've forgotten how to set up the return value so=
 that it's HTML) will do the trick. Notice the
get_transaction().abort() which Chris Withers told me about -- it causes=
 the transaction to be rolled back, which would normally occur when an=
 exception goes through, but since I'm catching the exception I have to do=
 it myself.

I'm not sure who is throwing the SMTPSenderRefused -- it may just be some=
 code in the MailHost object that's checking the address, or it may be the=
 mailer itself, in which case one could argue that the other code we've=
 been bouncing around may not be necessary.

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