The 6-Point Deliverability Audit Clients Fail
Most agencies blame “the algorithm” when emails land in spam. The real issue is usually poor infrastructure. When onboarding a new client for email campaigns, this is the 6-point audit you should run — and where things typically break: 1. Don’t send from your main company domain Start by asking: Are cold emails being sent from @yourcompany.com? If yes, stop immediately. The main domain is tied to core business functions - customer communication, invoices, and support. It carries long-term trust and reputation. Cold outreach introduces risk: spam complaints, bounces, and unsubscribes are inevitable. Using the primary domain for this puts that trust at risk. Fix: Use secondary domains (e.g., yourcompany.co, yourcompany.io) Keep the main domain protected. Run cold email on infrastructure that can be replaced or rebuilt if needed. 2. Authentication gaps SPF alone isn’t enough. You need all three properly set up: SPF, DKIM, and DMARC. In most cases: - SPF is present (because the ESP required it) - DKIM is misconfigured or broken - DMARC is missing or not enforced Fix: Properly configure all three. It takes minutes but significantly improves trust signals for inbox providers like Gmail and Outlook. 3. List quality over list size Start by asking: How is the list being built? If the answer is “scraped database” or “purchased from a lead vendor,” that’s the first red flag. In most cases, it’s better to rebuild from scratch. Cold email only works when the audience is relevant. A list of 10,000 random contacts will damage sender reputation far faster than a list of 500 highly targeted prospects will improve it. Fix: Focus on signals, not volume. Build lists using intent-based criteria such as: Recently posted about a problem your offer solves Hired for a role that clearly needs your service Raised funding, launched a product, or expanded into a new market 4. Timezone-blind sending