I did it, but it still sends the opt-in confirmation email. Here’s how:
By using the Silent Send feature, you can send the from-email captured on the screen to mailchimp. Using this feature will cause an email to be generated to the subscriber asking for an opt-in. Mailchimp will allow you to customize the opt-in email that is sent. Here’s what I did that worked:
Silent Remote Sending: Enabled Method: POST
Silent Remote URL:https://your-mailchimp-userid.us2.list-manage.com/subscribe/post?u=site-specific-string-of-characters=site-specific-numbers
Silent send fields to ignore:ex_field1
ex_field2
ex_field3
ex_field4
Silent send fields to rename: from_email=EMAIL
The key is to go into mailchimp under the list you have set up for your website subscribers, choose ‘Forms’. Then, under ‘For Your Website’, select the ‘Signup Form Embed Code’. There is a form for copy/paste into your site. I had to copy and paste the url just before the words method=”Post” into the url address for Silent URL, above, to get it to work. The other url addresses given by mailchimp didn’t work for me.