Can I set up an SPF record, in my personal email account, to send mail on behalf of my Zendesk Support address?
No, setting up an SPF record in your personal email account, to send mail on behalf of a Zendesk Support address will not work. Zendesk Support addresses do not function like traditional email clients, and will not be able to add permissions in your Gmail. You would need to use the Zendesk system to send messages from your Zendesk support address. For more information on SPF records, see the article: Setting up SPF for Zendesk to send email on behalf of your email domain.