Featured image & Border

I have used the Postie plugin on a couple of my websites.
I have this issue and need help to clear it. If there is an addon, I need to purchase or anything I miss here, Please let me know.

Problem 1:
From Mailchimp, I send an email to Postie and Postie posts it on my website, however, the featured image doesn’t appear on the post. I need an Image and the title below it, right now it posts only the title.

Example: https://flor.krpadesigns.com/events/

Problem 2: Borders (example: https://flor.krpadesigns.com/2020/06/29/test-with-campaign/)
Any newsletter coming from MailChimp has these borders appearing on the mail – on my website, how to get rid of it?

I appreciate your quick reply.

The page I need help with: [log in to see the link]