It’s a new year, but an old problem. Email with unloaded images.
Sure, you should be including critical content as text, and/or including alt-text as a normal part of your creative design process, but at the bare minimum you should look at what your mail looks like without images.
The last thing you want to do is send out email with just one strong call to action – the unsubscribe link.
With images loaded it was a really nice year summary mail, with a link to web content they’d clearly spent a lot of effort on. Without images, it’s just a call to unsubscribe.