What Is Email Deliverability and How to Improve It
Email deliverability measures whether your emails reach recipients’ inboxes instead of spam folders or bouncing. To improve it, authenticate your domain with SPF, DKIM, and DMARC, keep your email list clean by removing invalid addresses, write content that avoids spam triggers, and validate email addresses before sending with a solution like Trestle’s Real Contact API.
Email deliverability is the ability of an email to successfully land in a recipient’s inbox rather than being marked as spam or bouncing back. Businesses rely on email deliverability to ensure their messages reach their intended audience, making it a crucial factor in any email marketing or communication strategy.
Understanding Email Deliverability
Email deliverability is influenced by several key factors:
- Sender Reputation: Internet Service Providers (ISPs) track the history and reliability of your sending domain and IP address.
- Email Authentication: Protocols like SPF, DKIM, and DMARC help verify your identity as a legitimate sender.
- List Quality: Sending emails to outdated, inactive, or fake addresses increases bounce rates and damages deliverability.
- Engagement Rates: High open and click-through rates indicate to ISPs that your emails are wanted, improving deliverability.
- Content and Formatting: Poorly formatted emails, excessive links, or spammy language can trigger spam filters.
How to Improve Email Deliverability
1. Authenticate Your Emails
Implement authentication protocols such as:
- SPF (Sender Policy Framework): Defines which mail servers are authorized to send emails on behalf of your domain.
- DKIM (DomainKeys Identified Mail): Ensures email integrity by allowing the recipient’s server to verify that the message wasn’t altered in transit.
- DMARC (Domain-based Message Authentication, Reporting, and Conformance): Provides instructions to email providers on how to handle emails that fail SPF or DKIM.
2. Maintain a Healthy Email List
- Regularly clean your email list by removing inactive subscribers and invalid addresses.
- Use double opt-in to ensure you’re only sending to engaged recipients.
- Monitor and reduce bounce rates to protect your sender reputation.
3. Improve Engagement Metrics
- Personalize emails to increase open rates.
- Use compelling subject lines and valuable content to encourage clicks.
- Segment your audience to send relevant messages tailored to different subscriber groups.
4. Avoid Spam Triggers
- Avoid excessive use of ALL CAPS, too many exclamation points, or spammy phrases like “free money” or “guaranteed.”
- Keep a balanced text-to-image ratio, as image-heavy emails can be flagged as spam.
- Use a reputable email service provider (ESP) that adheres to best practices.
5. Monitor Your Sender Reputation
- Check your domain’s sender score using tools like SenderScore or Google Postmaster Tools.
- Keep an eye on spam complaints and take action to reduce them.
- Use dedicated IPs if sending high volumes of emails to maintain a good reputation.
6. Optimize Email Sending Practices
- Send emails at optimal times when recipients are more likely to engage.
- Avoid sending too many emails in a short period to prevent being flagged for spam-like behavior.
- Use re-engagement campaigns to win back inactive subscribers.
7. Use Trestle’s Real Contact API for Email Validation
One of the most effective ways to improve email deliverability is to verify that you are sending messages to valid and active email addresses. Trestle’s Real Contact API helps businesses verify and validate email addresses before sending, reducing bounce rates and improving sender reputation. Real Contact grades the email on an A to F grading scale, so it’s important to prioritize those that have an A or B email contact grade.
With Real Contact API, you can:
- Detect invalid, inactive, or disposable email addresses in real-time.
- Improve engagement rates by only sending emails to genuine recipients.
- Reduce spam complaints and hard bounces, ensuring a cleaner email list.
- Enhance email marketing ROI by targeting real users who are more likely to interact with your messages.
- Pair email validation with IP-based intelligence to flag suspicious form submissions before they enter your list.
By integrating Trestle’s Real Contact API into your workflow or by using the bulk upload feature in the Developer Portal, you can maintain a high-quality email list and maximize inbox placement for your campaigns. You can also integrate Real Contact by using our Real Contact Phone Grading App in HubSpot.
Email deliverability is a crucial aspect to ensure your messages reach their intended audience. By maintaining a clean email list, optimizing engagement, following authentication protocols, and avoiding spam triggers, you can improve your deliverability and maximize the impact of your email marketing efforts. Investing in email best practices, along with tools like Trestle’s Real Contact API, will lead to higher inbox placement rates, improved engagement, and ultimately, better results for your business.
Frequently Asked Questions
What is a good email deliverability rate?
Most industry benchmarks consider 95% or higher inbox placement a strong deliverability rate. The global average hovers around 83-85%, so anything consistently below 80% is a red flag for list quality, authentication, or sender reputation issues. If you’re in between 85-94%, there’s room to optimize but you’re not in crisis.
What’s the difference between email delivery and email deliverability?
Email delivery means the receiving server accepted your message (it didn’t hard bounce). Email deliverability is whether that accepted message lands in the inbox vs. the spam folder. You can have 100% delivery and still have poor deliverability.
How does email validation improve deliverability?
Validating emails before sending removes invalid, inactive, and disposable addresses from your list. This reduces hard bounces, which are one of the fastest ways to damage sender reputation. Trestle’s Real Contact API grades each email from A to F so you can prioritize sends to verified, high-confidence addresses.
How often should I clean my email list?
At minimum, validate your list before every major campaign or quarterly, whichever comes first. If you’re running high-volume sends or lead gen campaigns with third-party data, validate at the point of ingestion.
