The Dynamic Segments section of the Email area consists of the tool Segment Search, which returns all users that match a set of criteria e.g. retrieve All users that has signed up for a newsletter or All users in Denmark.
Selecting queries as the basis for a recipient group is a good way to make the recipients for an email flow dynamic.

To create a new Segment Search:
- Open the context menu for Segment Search
- Click + New Segment Search
- Configure the segment search:
- a Name
- The maximum number of users to include with Rows to fetch
- What criteria to use with Select by, possible to choose both a primary and secondary criteria
- Click Save
- Now open the context menu for the newly made segment search node and click Edit
- Click Manage in the Rules section
- Click + New Root Expression
- Choose FieldID, there are five kinds of criteria to choose from:
- User information, such as name, country or email permission
- User audit information, such as creation date, created by, and email permission updates
- User behavior on website, e.g. last login time, amount of loyalty points, placed an order
- User custom fields, select your custom fields as a criteria
- User behavior in email marketing, e.g. has received and opened a particular email, has clicked these links in a specific email
- Choose an operator and value to create your criteria, e.g. All users with email permission true:

Note, a segment search cannot be used directly for email marketing. You must first create a user group based on the segment search.