It's been suggested to me that I configure SPF records for my domain and I have done so. I use gsuite for email and have mx records properly configured to send mail via gsuite. My web app sends emails via Sendgrid's API and I also use Mailchimp for marketing emails.
I believe the following is the correct TXT record:
"v=spf1 a mx include:_spf.google.com include:sendgrid.com include:servers.mcsv.net ~all"
However, I have done a few tests which tell me that record includes too many DNS lookups. What's the best course of action here?