SEO for Email: Yes, It's a Thing! How to Make Emails Searchable in the Inbox - Litmus
Briefly

As an email sender, though, there's a lot you can do to help your subscribers find your emails fast-to dig back through the archives to grab a discount code, to send it to a friend, or to read it one more time. SEO: It's for emails, too.
Making your email searchable eliminates frustration from your subscribers if they're trying to find your emails, but it also follows accessibility best practices so all of your subscribers can access important information, no matter where or how they are reading your email.
Read at Litmus
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