A Short Rant
You all know that I'm an accessibility advocate, at least in my work, so this rant will come as no surprise to you.
Why would a legitimate business send an HTML email with linked graphics (meaning they exist somewhere else in cyberspace, not in the email itself) with no "ALT" tags, rendering the email unreadable to a specific segment of the population? There was no option to sign up for "plain text" email. Just HTML. And the HTML they sent was bad, but offers SOME sort of "gift" in the form of a sale and a rebate on some mystery product.
You may ask "why don't you allow linked graphics to appear?" Well, because if I do, that also confirms the validity of my email addresses, and in Mail.app, it appears you can only do all or none, not specify which individual message's graphics to show.
So, no thanks, Home Depot. You screwed up.