"Suggested for your library" emails
I have a greater appetite than many for emails from Logos suggesting resources for purchase. I enjoy looking at suggested resources, and am so interested in updating and adding key works to my library that FOMO, for me, overwhelms any sense that I get a lot of these emails, even though I get several each day.
But if they really are suggestions to me, they shouldn't include lots of resources I already own. I just got an email with four or five items on it that I already own. Web pages that list resources on sale note the ones I already own, so Logos should be able (especially in suggestions directed at individual subscribers) to sort resources the recipient owns and drop them from the email.
That would make these emails more effective sales tools, because I would know my time wasn't being taken checking which suggested resources I own.