Is there a way to integrate Mailgun, Sparkpost, or Mandrill with campaigns

Is there a way to integrate Mailgun, Sparkpost, or Mandrill with campaigns

Due to the known issues relating to deliverability, I would like to use an outside vendor. I know I can easily integrate Mailchimp with CRM, and the automation tools are nice. 

I would rather stay in the Zoho ecosystem and send mail through campaigns (I also know how much more powerful the automation tools are in campaigns). So I would like to know if there is a way to use an outside sendmail vendor to actually deliver the mail into the inbox. These systems have very good api's, but I dont see where to integrate them.