Add a DMARC, SPF or DKIM record

All three are TXT records. Pick where your domain’s DNS is hosted.

• CloudflareCloudflare dashboard → your domain → DNS → Records
• GoDaddyGoDaddy → My Products → your domain → DNS (Manage DNS)
• Amazon Route 53AWS console → Route 53 → Hosted zones → your domain
• Azure DNSAzure portal → DNS zones → your zone → Recordsets
• Squarespace Domains (formerly Google Domains)Squarespace → Domains → your domain → DNS → DNS settings
• NamecheapNamecheap → Domain List → Manage → Advanced DNS
• Google Cloud DNSGoogle Cloud console → Network services → Cloud DNS → your zone
• IONOSIONOS → Domains & SSL → your domain → DNS
• HostingerHostinger → Domains → your domain → DNS / Nameservers → DNS records
• Microsoft 365 (domains bought through it)Microsoft 365 admin center → Settings → Domains → your domain → DNS records
• Any other DNS hostThe DNS or zone editor at the company whose name servers your domain uses