You can't do that with Interspire Email Marketer but there is a different way. Interspire Email Marketer includes the ability to create a custom subscription form that you can add to your web site.
When your visitors fill out this form all of their details (including custom fields) are saved into your Interspire Email Marketer database. If you need to subscribe them automatically, you can use the hidden form approach.
To do this, simply create a Interspire Email Marketer form and use JavaScript to automatically submit the form. Add this code to the end of the page:
<script>document.forms[0].submit();</script>
You will also need to pre-populate the form fields. You can do this using PHP. If you're not sure how we're more than happy to show you if you get stuck - just send an email from the client area.

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