Enabling DKIM for Sendgrid
In order to enable DKIM for SendGrid go through the following steps:
Login to your SendGrid account
Go to Settings > Sender Authentication > Authenticate Your Domain by clicking on Get Started
Now choose your DNS Host (GoDaddy, Bluehost, Cloudflare) from the options and click on Next.
Enter the domain name you would like to authenticate and click Next.
You will be able to see 2 DKIM records now (Selector1 – s1 and selector 2 – s2) respectively.
Now you may publish these 2 DNS records for your domain and we’ve completed the DKIM authentication setup process for SendGrid.