Mailchimp and squarespace

Site URL: http://www.oldish.com

I am using the free version of mailchimp to send out an automated email to subscribers to let them know a new blog post is up. 

I want to only show the first image, title and an excerpt of the blog post in the email. When I choose the excerpt option on mailchimp, the whole blog post is still showing in the email. I have tried putting some copy in the excerpt option in the Squarespace blog but it messed up the blog format. Does anyone know how to only show the title, the first image and an excerpt in the mailchimp platform? 

I'm having the same issue! I haven't figured it out yet.  Did you ever figure it out>