Choosing the sending domain to use when making a campaign.

I have thee smtp services setup that are assigned to this account, sparkpost, mailgun, and sparkpost. When I make a campaign and template how do I choose which service to use for that email campaign? Its defaulting to one currently all the time I want to be able to pick and choose which one it goes out on.
 
@Binary Attribution - Go to backend/index.php/settings/customers/servers ( Backend > Settings > Customers > Servers ) and set "Can send from system servers" to Yes. Then you will be able to select servers in campaign.
 
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