This particular SPF record include:_spf.quotientapp.com is no longer needed.
While it's not critical, we recommend you remove it from your DNS records. Just be careful not to remove any SPF records that are required for other online services.
There's a new way to send emails from your own emails address, along with a new way to have your domain name authenticated with Quotient.
To upgrade see Account Settings > Add-ons > Custom Domains for Email.