The Email Infrastructure Audit: The Technical Setup Checklist Most Agencies Skip That Determines Whether Your Emails Even Land in the Inbox
By Loyal Send8 min read
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Most agencies selling you email services are selling you content calendars and design templates. They're building your flows, crafting your subject lines, and obsessing over your copy. They're not touching your email infrastructure.
Here's the problem: an email deliverability audit is a systematic process of evaluating all of the elements of your email marketing program—and most agencies skip the technical layer entirely. They'll spend weeks on your welcome email sequence while your domain reputation craters because nobody set up SPF, DKIM, and DMARC correctly.
If you're talking deliverability, none of that means anything unless you're focusing at the domain level. Your beautifully crafted emails land in spam because of what happens in the 200 milliseconds between you hitting "send" and your subscriber's inbox deciding where to route it.
This checklist exists because your Klaviyo deliverability best practices could be perfect. Your email inbox placement checklist could be comprehensive. But if your DNS records are misconfigured and your sender reputation is tanked, nobody's reading a single word.
The Dirty Secret About Agency-Delivered Email Programs
Your email infrastructure setup only matters if you're asking the right questions. According to r/Emailmarketing ↗, "if you're talking deliverability, none of that means anything unless you're focusing at the domain level." Most agencies audit open rates and click rates. They skip the foundation. And if your domain reputation is trash, your emails go to spam—no matter how good your copy is.
Email infrastructure is the set of software and hardware components that are triggered as soon as you write an email and hit the send button. This is where your deliverability lives or dies. Technical infrastructure decisions like choosing email service providers directly affect sender reputation—your subject lines don't matter if your emails never reach the inbox.
The agencies selling you email services are selling you content calendars and design templates. They're building your flows, crafting your subject lines, and obsessing over your copy. But they won't spend ten minutes on your DNS records. That's not a strategy. That's an email deliverability audit waiting to fail.
The Domain-Level Truth That Changes Everything
Here's where most Shopify brands get wrecked. They're running one domain for everything—sending, tracking, and replies. That's not a strategy. That's a disaster.
Separating your sending domain from your tracking domain prevents reputation contamination when one gets flagged. You send transactional and marketing emails from send.yourbrand.com. You track opens and clicks with track.yourbrand.com. When one gets blacklisted, the other survives. This is basic email inbox placement checklist hygiene that most agencies ignore because they don't want to explain DNS records.
Set up SPF, DKIM, and DMARC correctly. Without these, your emails look like spam to every major inbox provider.
Your from-address domain affects how ESPs score you. Use Google Workspace for all mailboxes—don't use cheaper alternatives that have worse reputation. Cheaper email providers have garbage sender scores. Gmail and Yahoo notice. Your deliverability tanks, your revenue drops, and you spend months trying to fix damage you could have prevented by spending $6/month on the right infrastructure.