A segment is a list of email addresses that can be targeted when sending messages. OptiPub supports two types of segments:

Static — A fixed list. Emails are added and removed manually via import, API request, or other action.
Dynamic — A query-based list. The segment automatically updates based on search parameters you define.

Once a segment is created, its type cannot be changed.

Create a Static Segment

Navigate to Messaging > Segments.
Click Create.
Select Static as the segment type.
Fill in the required fields:

Field	Required	Description
Publication	Yes	The publication this segment belongs to.
Name	Yes	A descriptive name for the segment.
Description	Yes	A brief description of the segment's purpose.
Auto Responder	No	An auto responder to trigger when a subscriber is added.
Redirect URL	No	URL to redirect to after a subscriber is added.
Hash Type	No	Encryption for suppression lists: None, MD5, SHA-256, or SHA-512.

Click Save.

After creating a static segment, use the Import button to add subscribers. See Importing to a Segment for details.

Create a Dynamic Segment

Dynamic segments automatically refresh their email list based on query conditions. They are rebuilt nightly.

Dynamic segments consume system resources as long as they exist. Delete dynamic segments that are no longer in use.

Navigate to Messaging > Segments.
Click Create.
Select Dynamic as the segment type.
Fill in the required fields (Publication, Name, Description).
Build your query using the condition builder:

Condition Group	Description
AND	Email matches all conditions.
OR	Email matches any condition.
AND NOT	Email matches none of the conditions.
OR NOT	Email does not match at least one condition.

Available query conditions include: email match, domain match, variable match, sign-up date, expire date, message clicks/opens, subscribed/unsubscribed/lead publications, segment membership, addons, tags, source campaign, campaign visits, and funnel activity.

Optionally, add sub-query condition groups for more complex filtering.
Optionally, set a result limit to cap the number of subscribers (default: all results).
Click Save.