Validating email addresses (ie. attempting delivery)

Hi,

Has anyone created a GF plugin to truly validates email addresses? I've found code out there that will do it, like this:

https://code.google.com/p/php-smtp-email-validation/

The code basically attempts to see if the email address is valid on the user's mail host. I can see why this might not be good (network delays, etc). But, in my case, we want to validate email addresses of people at one organization (Wheaton College).

If noone has done this, could you point me in the right direction for doing so? Should this be an entirely new kind of field in GF, or is it possible to add an option to the existing email field?

thanks.

Hi Chris, can that code also be used to ask users to answer a question like: "3+4=" instead of using a captcha?

Chris, thanks. Is there a way to add an option to the existing email field. I can think of two options I might like:

1) must be a somedomain.com email address

2) validate this email address

thanks.

Thanks. This helps, but I'm wondering if I can add -options- to the existing email field?

Thanks. Sorry.

I would like to use the standard email field. But, I'd like to add an advanced option or two to it.

It could be similar to the current "Enable Email Confirmation" -- a simple checkbox. If the admin selects it, then my validation runs on the field upon submission.

In my case, I think I'd like to add two options.

- "Require a somedomain.com address"
- "Validate email address by attempting delivery"

Selecting either one of those would fire off the gform_validation hook code, which I'd write.

Is it possible to add options like this to the existing email field (and other fields)?