How to Fix Email Deliverability Issues That Kill Revenue

To fix email deliverability issues that kill revenue, focus on three critical areas: proper technical authentication (DMARC, DKIM, SPF records), content optimization with adequate text-to-image ratios, and aggressive list segmentation to remove non-engaged subscribers. These foundational changes can increase open rates from 12% to 70% and double email revenue within weeks.

Set Up Email Authentication Records to Pass Security Checks

The February 2024 updates from Google and Yahoo made proper email authentication mandatory, not optional. These security protocols verify that emails actually come from your domain and aren’t spam or phishing attempts.

Start with these three essential records:

• DMARC (Domain-based Message Authentication): Acts as your email’s security bouncer, telling email providers how to handle suspicious messages
• DKIM (DomainKeys Identified Mail): Creates a digital signature proving your emails are legitimate
• SPF (Sender Policy Framework): Lists which servers can send emails on behalf of your domain

Most email service providers like Klaviyo and Sendlane make this process straightforward through dedicated sending domains. The setup involves copying and pasting a few DNS records—it’s not as technical as it sounds, but getting it wrong can devastate your deliverability.

One small mistake can tank your results. Nikita Vakhrushev from Aspekt Agency discovered a client’s email sending domain was “one letter off” from their actual domain, causing open rates to plummet from 40-50% to just 10-12% overnight. Once corrected, their rates jumped to 70-80%.

Optimize Email Content to Pass Spam Filter Screening

Beautiful image-only emails might look professional, but they’re deliverability disasters waiting to happen. Email providers like Gmail, Yahoo, and Outlook scan your content before delivery, and images alone don’t provide enough context for their algorithms.

Here’s how to fix email deliverability issues through content optimization:

Add substantial text content: Include body text that describes your offer, product benefits, or brand story. This gives email providers context about your message’s purpose and legitimacy.

Use descriptive alt text: Every image should have alt text explaining what it shows. This serves both accessibility and deliverability purposes, helping algorithms understand your content.

Minimize unnecessary links: Reduce social media links to just your primary platform (Instagram, Facebook, or TikTok). Too many URLs can trigger spam filters and hurt your sender reputation.

Structure for scannability: Use headers, bullet points, and clear call-to-action buttons. This improves both user experience and algorithmic comprehension.

“Gmail, Yahoo, Apple, and Outlook are scraping your emails before they even get to the customer’s inbox. When they scrape them, they look for content to determine whether an email is spam or should be delivered to your inbox. If you don’t include any details, all they get is just a URL to the image.” — Nikita Vakhrushev, CEO of Aspekt Agency

Implement Smart List Segmentation to Boost Engagement

List segmentation isn’t just about personalization—it’s critical for maintaining sender reputation and avoiding spam folders. Email providers track engagement rates, and sending to unengaged subscribers drags down your overall performance.

Remove recent openers from new campaigns: Don’t send another email within 24 hours to someone who already opened your last message. This prevents email fatigue and maintains positive engagement signals.

Clean out inactive subscribers: If 200 out of 1,000 subscribers haven’t opened emails in three months, they’re “muddying the pool” for your engaged audience. Remove them to improve deliverability for active subscribers.

Segment by email provider: When deliverability issues arise, start by re-engaging your most recent Gmail users specifically, then gradually expand to your full list as reputation improves.

Use engagement-based frequency: Send 2-3 emails per week to your general list, but create separate cadences for highly engaged subscribers who can handle daily messages.

The psychological barrier to list cleaning is real—marketers hate seeing subscriber numbers drop. But one case study showed a children’s toy brand increasing monthly email revenue from $9-10k to $25k simply by restructuring their welcome flow and cleaning their list to focus on engaged subscribers.

Monitor and Recover Your Sender Reputation

Google Postmaster Tools acts as your “canary in the coal mine” for email deliverability problems. This free tool shows your IP reputation, domain reputation, and spam compliance rates—critical metrics that most marketers ignore until it’s too late.

When deliverability crashes, follow this recovery process:

1. Install monitoring: Set up Google Postmaster Tools immediately to track your sender reputation
2. Start small: Begin re-engagement with your 500 most recently engaged subscribers
3. Scale gradually: Expand your sending pool from 500 to 1,000 to 5,000+ as engagement rates improve
4. Track improvements: Monitor open rates and reputation scores as you rebuild trust with email providers

This methodical approach helped recover one brand from a 12% open rate disaster to sustained 60-70% rates across their entire list. The key is patience—rebuilding sender reputation takes time, but the revenue impact is immediate once trust is restored.

Key Takeaways

• Proper DMARC, DKIM, and SPF setup is now mandatory for email deliverability—even small configuration errors can tank your open rates overnight.
• Image-only emails fail spam filter screening because algorithms can’t extract meaningful content from pictures alone.
• Sending to unengaged subscribers hurts deliverability for your entire list—aggressive segmentation and list cleaning improve overall performance.
• Google Postmaster Tools provides essential sender reputation data that most marketers ignore until deliverability problems become revenue disasters.
• Email frequency of 2-3 messages per week works best, with segmentation to avoid sending multiple emails to recent openers within 24 hours.
• Recovery from deliverability issues requires gradually rebuilding sender reputation by starting with your most engaged subscribers and scaling up slowly.