# Communication properties for user interaction

Understanding how users engage with different communication channels is essential for optimizing outreach strategies, improving responsiveness, and personalizing experiences. The **Communication Properties** outlined in this documentation serve as key indicators of user interaction across interfaces such as Inbox, Email, SMS, Push notifications, and broader General interactions.

These properties are designed to help operators monitor and respond to engagement signals using three primary event markers:

* **Last Clicked Date** – when the user last actively engaged with a communication.
* **Last Open Date** – the most recent time a user accessed a message or notification.
* **Last Send Date** – the timestamp of the latest communication dispatched to the user.

Together, these signals form a behavioral fingerprint of user interaction, enabling smarter decision-making, from re-targeting efforts to segment-based automation. Whether you're triggering workflows, assessing engagement trends, or refining message timing, these properties provide a foundation for interpreting user intent and responsiveness.

The following tables detail these properties per channel, outlining their structure, intended use, and operational impact.

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### Inbox

<table><thead><tr><th width="328">Property tag</th><th width="141">Type</th><th>Note</th></tr></thead><tbody><tr><td>{{state.inbox_last_clicked_date}}</td><td>Date &#x26; Time</td><td>Timestamp of user's most recent Inbox Click</td></tr><tr><td>{{state.inbox_last_open_date}}</td><td>Date &#x26; Time</td><td>Timestamp when Inbox impression was registered</td></tr><tr><td>{{state.last_marketing_inbox_sent_date}}</td><td>Date &#x26; Time</td><td>Date/time when last Inbox was sent <em>(only campaigns of category "Marketing" are counted)</em></td></tr></tbody></table>

### Email

<table><thead><tr><th width="328">Property tag</th><th width="141">Type</th><th>Note</th></tr></thead><tbody><tr><td>{{state.mail_last_clicked_date}}</td><td>Date &#x26; Time</td><td>Timestamp when user clicked last time on any link in the mail sent by Smartico</td></tr><tr><td>{{state.mail_last_open_date}}</td><td>Date &#x26; Time</td><td>Timestamp when user opened last time any mail sent by Smartico</td></tr><tr><td>{{state.last_marketing_email_sent_date}}</td><td>Date &#x26; Time</td><td>Date/time when last Email was sent <em>(only campaigns of category "Marketing" are counted)</em></td></tr></tbody></table>

### SMS

<table><thead><tr><th width="328">Property tag</th><th width="141">Type</th><th>Note</th></tr></thead><tbody><tr><td>{{state.sms_last_clicked_date}}</td><td>Date &#x26; Time</td><td>Timestamp when user clicked last time any SMS sent by Smartico</td></tr><tr><td>{{state.last_marketing_sms_sent_date}}</td><td>Date &#x26; Time</td><td>Timestamp when last SMS was sent <em>(only campaigns of category "Marketing" are counted)</em></td></tr></tbody></table>

### Push

<table><thead><tr><th width="328">Property tag</th><th width="141">Type</th><th>Note</th></tr></thead><tbody><tr><td>{{state.push_last_clicked_date}}</td><td>Date &#x26; Time</td><td>Timestamp when user clicked last time on any link in the push notification sent by Smartico</td></tr><tr><td>{{state.push_last_open_date}}</td><td>Date &#x26; Time</td><td>Timestamp when user have seen last time any push notification sent by Smartico</td></tr><tr><td>{{state.last_marketing_push_sent_date}}</td><td>Date &#x26; Time</td><td>Date/time when last Push notification was sent <em>(only campaigns of category "Marketing" are counted)</em></td></tr></tbody></table>

### Pop-up

<table><thead><tr><th width="328">Property tag</th><th width="141">Type</th><th>Note</th></tr></thead><tbody><tr><td>{{state.last_marketing_popup_sent_date}}</td><td>Date &#x26; Time</td><td>Date/time when last Popup was sent <em>(only campaigns of category "Marketing" are counted)</em></td></tr></tbody></table>

### General

<table><thead><tr><th width="328">Property tag</th><th width="141">Type</th><th>Note</th></tr></thead><tbody><tr><td>{{state.core_last_visit_date}}</td><td>Date &#x26; Time</td><td>The date/time when user clicked on any link in any type of communication sent to user <em>(except popups and inbox)</em></td></tr></tbody></table>