How to Audit Your Cold Email Infrastructure

Regular infrastructure audits prevent deliverability problems before they start. Here is a comprehensive audit checklist.

Monthly audit checklist

Domain health: Check each domain's SPF with the SPF Checker. Check DMARC with the DMARC Checker. Run full DNS checks with the DNS Checker. Blacklist check: Run each domain through the blacklist checker. Address any listings immediately. Deliverability test: Send test emails from each account to seed addresses across Gmail, Outlook, and Yahoo using the deliverability checker. Flag any accounts with less than 85% inbox placement. Reputation check: Review Google Postmaster Tools for each domain. Note any reputation changes. Account health: Verify all accounts are active, not suspended, and sending correctly. Check warmup metrics for each account. Volume review: Confirm total daily sends per account (warmup + campaigns) are within safe limits.

Quarterly audit additions

DKIM key freshness: Consider rotating DKIM keys every 6 to 12 months. Domain age analysis: Identify any domains approaching problematic age thresholds. Infrastructure capacity: Use the Cold Email Volume Calculator to confirm your infrastructure matches your volume needs. Retirement review: Identify any underperforming domains or accounts that should be retired and replaced.

The audit habit

Schedule infrastructure audits as recurring calendar events. When audits happen consistently, problems are caught early — before they cause campaign-level deliverability failures.

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