SPF and DKIM
Can someone please tell me how to get DKIM and SPF set up? I'd like to use Mailgun or Sendgrid for sending and receiving my email but they (both) require DKIM and SPF records. I added (their) DNS entries in the DO DNS panel as supplied and they aren't showing up when I verify on their system so I'm assuming there's something else I need to do. My system is CentOS 6.4 x64, Nginx.