# Constraints management

![](/files/rJQlTK73vAGgg8PMg5x1)

### Master filter

If you want your users to have limited access to the assets within your tenant, you can set Master filter. For example, you may want your users to have access to assets created by your company/project and not to provide access to other assets available in connected blockchain.

To set Master filer, you should select “Administrate” in sidebar menu and go to “Constraints”. You can select any available filter in the tenant. Filters can be created and edited in the advanced search. 

If you set a master filter, the users of the tenant will only be able to find the assets which are consistent with this filter in the list of owned assets, in the Asset search and in Market functionality. 

### Email sending

This constraint allows you to turn on and off email sending. In case this setting is on, emails are sent with the content according to templates defined in Templates section.

{% hint style="info" %}
We strongly recommend to go through the text of email templates and adjust them in [Templates management](/white-label-management-tool/admin-user-guide/wlm-configuration/templates-management.md) before switch on this feature
{% endhint %}

### Spark Factor Modifier

{% hint style="danger" %}
Not available at the moment
{% endhint %}

This constraint allows your users manage Spark Factor Modifier when creating their assets. The modifier defines how the Spark Factor (correlation between Spark and natural unit of measure of the asset) changes over the time.


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