Setting the Default Email Font
You can set the default font when composing emails across the system by going to Setup > System Wide Settings

In the **Default Email Font **drop-down select the font you wish to use as your default font for any email composition
This font will be enabled for all users as the default font when composing emails via Profiler
When you have set the font you want, scroll to the bottom and click Save Changes. This will apply immediately.
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