Use deliver_later instead of deliver_now

app/models/blazer/check.rb

@@ -14,7 +14,7 @@ module Blazer
 
       # do not notify on creation, except when not passing
       if (state_was || state != "passing") && state != state_was && emails.present?
-        Blazer::CheckMailer.state_change(self, state, state_was, rows, error).deliver_now
+        Blazer::CheckMailer.state_change(self, state, state_was, rows, error).deliver_later
       end
       save!
     end

lib/blazer.rb

@@ -86,7 +86,7 @@ module Blazer
     end
 
     emails.each do |email, checks|
-      Blazer::CheckMailer.failing_checks(email, checks).deliver_now
+      Blazer::CheckMailer.failing_checks(email, checks).deliver_later
     end
   end
 end