Either everyone qualifies, or no one qualifies.
On signup they can click on their preferences which adds
a custom property to their profile - receiving emails twice a week, one a week, or once a month.
The other option is to choose the content they wish to receive: sales and promotions, new products, blog posts.
I'm trying to create a segment of people in the main emailing list
who haven't let us know how frequently they want to receive emails
or the type of emails.
If I create the segment saying “Is not set” or contains “xxx” (listing all the possible choices) it’s either empty, or full. Trying to figure out how I can send an email or target the people who haven’t yet updated their preferences as it’s important to me to improve our open rates (which are slipping).