There’s nothing more frustrating than launching a cold email campaign, only to see low open rates, no replies, and poor performance.
And here’s the kicker: it’s probably not your copy. It’s your email deliverability.
At our agency, we run email deliverability audits to identify exactly what’s blocking your emails from reaching your prospects. If you’re struggling with cold email performance, this guide walks you through how we troubleshoot deliverability—step by step.
Step 1: Run a Domain Health Check
First, we check your DNS records for SPF, DKIM, and DMARC. If even one is missing or misconfigured, your emails might be flagged as spoofed or unauthorized.
If your cold email campaigns aren’t converting, the issue might not be your messaging—it might be that your emails never reach the inbox in the first place.
Deliverability is the silent killer of outreach. You could have the perfect copy and offer, but if your setup is flawed, you’re shouting into the void. At our agency, we specialize in identifying and fixing the hidden issues that sabotage outreach campaigns. Here’s how we approach a comprehensive cold email deliverability audit, and how you can apply the same principles to your own systems.
What we check:
- Is SPF configured correctly for your sending tool?
- Is DKIM properly aligned with your domain?
- Is DMARC set to monitor or enforce policies?
Fixing these builds trust with providers like Gmail, Outlook, and Yahoo—paving the way to the inbox.
2. Implement a Strategic Warm-Up Schedule
Are you sending from a new domain? Or did you go from 0 to 5,000 emails in a day? That’s a huge red flag to email providers. We help you rebuild trust with a gradual warm-up process.
Sending a high volume of emails from a new or inactive domain can trigger spam filters instantly. We guide our clients through a phased warm-up process that gradually increases sending volume while maintaining engagement.
Warm-up recommendations:
- Week 1: 50–100 emails/day
- Week 2: 150–250/day
- Week 3+: increase based on performance
This builds a positive sender reputation, which is essential for scaling outreach safely.
3. Clean and Segment Your Email Lists
Sending emails to bad addresses or people who never engage? That’s killing your sender score. We remove invalid emails, suppress cold leads, and set engagement thresholds to keep your lists clean.
Deliverability is not just about what you send—it’s also about who you send it to. Sending emails to unengaged or invalid contacts signals poor list quality to providers. Over time, this hurts your sender score.
What we do:
- Run list verification to remove bad emails
- Pause contacts who haven’t opened in 30+ days
- Segment active vs inactive leads for targeted re-engagement
The goal is to send only to people who are likely to interact.
4. Review Your Copy for Spam Triggers
Spam filters love to scan for certain phrases and patterns. Things like:
- All caps or aggressive language
- Overused sales terms (“risk-free,” “buy now”)
- Poor formatting or HTML issues
Even with perfect technical setup, your message content matters. Certain keywords, formatting, and punctuation patterns can cause filters to flag your emails. We audit cold email copy to reduce deliverability risks while preserving tone and curiosity.
Common issues we address:
- Excessive capitalization or punctuation (e.g., “ACT NOW!!!”)
- Overused sales terms (e.g., “free,” “guaranteed,” “risk-free”)
- Lack of personalization or plain-text formatting
We recommend testing subject lines with tools like mail-tester or GlockApps to catch red flags before sending.
5. Establish a Consistent Sending Schedule
Erratic volume or timing gets flagged fast. A regular daily or weekly cadence builds trust and helps maintain inbox placement long term.
Email platforms favor senders with regular, predictable behavior. Sudden spikes in volume or irregular timing can trigger suspicion. We help clients build a cadence plan—such as daily or weekly sends—that mimics natural communication patterns.
Best practices:
- Send at consistent times each day/week
- Avoid “blasting” thousands in a single drop
- Maintain rhythm even during slower campaign periods
Consistency signals stability—and inboxes love that.
Bonus Tip: Monitor Your Reputation
Tools like Google Postmaster Tools, Microsoft SNDS, and Sender Score help you track how ISPs perceive your domain. If you’re not using these, you’re flying blind. We include reputation monitoring in every audit we perform, so our clients stay ahead of issues before they escalate.
Final Thoughts
Deliverability isn’t a nice-to-have. It’s the foundation of any successful cold email strategy. Without it, you’re burning time, budget, and opportunity.
Our agency works with companies to audit, fix, and optimize their cold outreach systems—starting with the inbox. Whether you’re just getting started or scaling a proven campaign, making sure your emails actually land is priority #1.
Need help diagnosing your cold email issues?
We offer deliverability audits that uncover what’s holding your campaigns back—and how to fix it. Let’s make sure your next email doesn’t go straight to spam.
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