---
title: "Check Logic, Preview Message & Preview Links"
slug: "check-logic-message-preview-link-previews"
updated: 2026-02-27T14:11:53Z
published: 2026-02-27T14:11:53Z
canonical: "knowledge.technolutions.net/check-logic-message-preview-link-previews"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://knowledge.technolutions.net/llms.txt
> Use this file to discover all available pages before exploring further.

# Check Logic, Preview Message & Preview Links

In a [Deliver](/v1/docs/deliver-overview) message, you can use **Message Preview** and **Check Logic** to test logic for specific records, preview sample messages, and confirm that a record meets the logic of the recipient list query. **Link Previews** ensure the validity of your links.

## Check logic

To check the logic within a Deliver message:

1. Go to **Deliver**.
2. Select a mailing, or [create a new one](/v1/docs/deliver-new-mailing-settings-1).
3. Select **Preview Message.**
4. Configure the following settings:
  - **Recipient List**: If more than one recipient list is associated with a mailing, select the one you want to test using the recipient list dropdown.
  - **Record**: Enter the name of a record using the Record Lookup.
  - **Filters**: Displays filters for the selected recipient list
    - ✅ indicates the record meets the filter criteria
    - ❌ indicates the record does not meet the criteria of the filter in the recipient list query
  - **Past Runs**: Whether the record has been pulled in the live recipient list query for this mailing. If it has, it will not be eligible to receive this mailing again.
5. Select **Preview.** The mailing appears as it would for the selected record.

## Preview message

This is particularly helpful for testing different permutations of Liquid markup.

To view a preview of the message:

1. Select **Preview Message**
2. Select a recipient list
3. In the **Record** field, enter a name.

The message appears as it would to that record.

As an example, the mailing may include Liquid markup to conditionally display text based upon a student’s academic interest. If Jane has a value of History for an academic interest, the message may differ from Timothy, who has a value of Biology for an academic interest. Testing this prior to scheduling the mailing is made easier through the use of the Preview Message feature.

> [!TIP]
> ⭐ Best Practice
> 
> Test conditional logic before scheduling a mailing.

## Preview links

**Preview Links** lets you preview the endpoint landing page of all of the links in a Deliver mailing.

- Go to **Deliver.**
- Select a mailing, [create a new one](/v1/docs/deliver-new-mailing-settings-1).
- Select the **Preview Links** icon—it appears in a row with the options to switch views from desktop to mobile devices.

![](https://cdn.us.document360.io/cd8ea7a6-07f3-4846-a554-627ac016d3e3/Images/Documentation/Preview links.png)

The Preview Links pop-up displays:

- A desktop preview of the message
- Smartphone preview of the message
- Image previews of each link destination
- Warning icons for each dead link

Each link in the mailing appears in the pop-up and can be selected to ensure correct navigation.