# When {% @arcade/embed flowId="pvdJYktd0CJpN7JUwT6y" url="" %} ### Start Sending Messages Schedule your campaign to be sent immediately, at a specific time, or at the best time for each user. #### Now Sends your campaign instantly to all selected users.

#### On a specific time Schedule your campaign for a chosen date and hour. You can also enable Send based on user’s time zone to ensure each user receives it at the same local time. {% hint style="warning" %} **Send Based on User's Time Zone Configuration Details:** If on a specific time option is not selected, messages will be sent according to the system’s default time (**GMT+3**). You can use this for global launches or synchronized announcements that should reach all users simultaneously. {% endhint %}

#### Send on best time for each user between Automatically delivers notifications at each user’s optimal engagement time based on their past activity. This lets the system automatically determine the **optimal delivery hour** for each user, based on their historical in-app activity. This option helps maximize engagement by sending notifications when users are statistically most active. > For more details about how this feature works, see the [best-time-delivery](https://user.netmera.com/netmera-user-guide/ai-features/best-time-delivery "mention") section.

### Delivery Speed Delivery Speed setting controls **how quickly your campaign is delivered** to your target audience. You can choose to send your push notification to **all users at once** or **in smaller packages** at defined time intervals. Using packages helps prevent server overload and ensures a smoother delivery experience, especially for large audiences. {% hint style="info" %} **Example** Sending the notification to your entire user base simultaneously might cause heavy traffic or even server crashes. To prevent this, you can use the **Delivery Speed** tab to set a **package size** and **time interval** between batches — for example, sending the notification to 10,000 users every 10 minutes. This gradual rollout ensures stable performance while still reaching your full audience in a controlled and efficient way. {% endhint %}

### Message Expire Time You can set an **expiration time** for each push notification. Once this time is reached, the message will **automatically** disappear from the user’s notification center. This feature helps you manage time-sensitive campaigns and keep users’ notification panels relevant. {% hint style="info" %} **Example** By setting an expiration time of such as 24 hours, you can ensure that the offer remains valid only within that period. This approach creates a sense of urgency, encourages quicker engagement, and prevents users from trying to use expired offers- helping maintain a smooth and frustration-free experience. {% endhint %}