Change the Excerpts method

Hi there,

So I read in this topic http://support.mailpoet.com/knowledgebase/excerpts-in-wysija/?utm_source=wpadmin&utm_campaign=editor how Mailpoet take the excerpts when display the latest posts.

How I can change so the “First 60 words” to be the most important ? I put the More tag at the and of Premium posts, and in this case, MailPoet display all post text in mail, and this is bad..

Thanks.

https://wordpress.org/plugins/wysija-newsletters/