Still Struggling With Settings

The 560×1120 is just an indication of the crop limitations. A square image will be cropped to 560×560 … the 1120 would only factor in if you uploaded a really tall image, that would end up being taller than 1120 if the width was cropped to 560 (generally this will be things like infographics, which tend to be really tall compared to their width).

I do not know how Bloglovin handles images–one option to consider is to use the alternate feed for MailChimp, so it will use downsized images, but then the main feed for Bloglovin (and other feed readers). This is what I do with my site, so that users using Feedly or Flipboard or other services get the larger images from my site, because those services can handle it. Only MailChimp gets the alternate feed. (Suggesting because I would assume Bloglovin can happily handle large images, but that’s just me guessing.) Hope that helps–

Thanks so much for your very prompt and helpful response! I have one more question. With an alternate feed, I’d have to re-set my settings to full text? I’d changed them to summary because I often use photo galleries (rows of photos) in posts. That used to work fine when I used Feedburner to send RSS emails but Mailchimp seemed to be splitting apart my galleries into long vertical lines of huge photos.

You can keep the settings on Summary. MailChimp is not the one changing your images; that is the plugin changing the gallery images to their full size versions, because I’ve considered thumbnails/small images in emails to be pointless, because if you click on one, you get the image opened directly in your browser (instead of in a lightbox, which seems to be standard for most image galleries). With email limitations for displaying galleries, rendering the images as full size usually makes more sense.