If you’re starting from zero, this is the order of operations.
Step 1: Procure 3-5 sending domains. Step 2: Set up Google Workspace inboxes. Step 3: Configure SPF, DKIM, and DMARC. Step 4: Run controlled warmup for 2 weeks. Step 5: Build your first campaign.
Most teams skip step 3 and wonder why they hit spam. Don’t be most teams.