We have added full support for sending emails using SparkPost into our Ruby on Rails app. SparkPost is one of the biggest email-sending providers in the world. Now in Business Booster CRM users can use their own SparkPost account or use default Booster account. Newly registered mails for sending are automatically registered at SparkPost. User sending server is ready after confirming its domain ownership by clicking on link in email from SparkPost. Support information for applying DKIM and SPF records are also given to the user. User can increase his email deliverability success to customers by adding this records into his domain server.