Need help sending user registration details to my email software

I am trying to find a workable way to send member registration information to my email marketing software on the fly … and am close to pulling my hair out! Any help would be appreciated.

Basically my site registration form captures username, password, email and a couple of additional details. I want to forward this info to my email software (Interspire), but I don’t want to do it on registration as the email address has yet to be confirmed, so I want to do it on account activation instead.

I have tested a page that populates a hidden form with the necessary details and sends it using javascript. This works great. The only problem is where to trigger it.

Because it causes a screen refresh, I kinda have to call it between pages. e.g. between my login page and the homepage (the site is a private site).

Unfortunatelty I can’t do this because the activation email link appears to auto-login, bypassing my login page, so the form page isn’t called.

Is there another place I can call this form page from, or another way of sending the details on account confirmation?

Help please!

P.S. I have a complex series of emails, triggers and autoresponders to set up, so I have to use an external email solution - I can’t do what I need to on the email side from within EE. Mark.