If you’d prefer to send a digest style email with multiple posts in it, that’s easy to do with FeedBolt.
First, on your feed, change the frequency to check to something like weekly or biweekly (every 2 weeks).
Next, in your template, use post-specific merge fields so you can layout the most recent post, the second most recent post, etc. using merge fields like ~RSS.title1~ for the most recent post, ~RSS.title2~ for the second more recent post and so on.