Post Expirator is a great plugin that lets you set a date for a post to be removed. See https://wordpress.org/plugins/post-expirator/ for more information.
This AddOn allows you to specify the Post Expirator options in your email. For example:
[postexpire when="2019-08-09 17:00" how="delete"]
This will set the post to expire on Aug 8, 2019 at 5:00pm.
when should be some date and time in the future.
how should be any of the options that post expirator provides except for the category choices.
This AddOn requires the Postie Shortcode addon.