Do you struggle getting your marketing emails through spam filters? Want to know how email companies decide whether to allow your emails through?

Email marketing is a powerful tool for businesses and individuals alike. It allows you to reach your audience directly, share important information, and promote your products or services.

However, if your emails are not being delivered to your recipients’ inboxes, your email marketing efforts are in vain. Email deliverability is a critical aspect of any email marketing strategy, and there are several factors that can affect it.

In this blog post, we will explore nine factors that can impact email deliverability. Understanding these factors and taking steps to address them can help ensure that your emails reach their intended recipients and achieve the desired results.

Experian share the factors of email deliverability in this infographic.

 

Sender Reputation

One of the most crucial factors that affect email deliverability is the sender’s reputation. Email service providers (ESPs) like Gmail, Yahoo, and Outlook use complex algorithms to determine whether an email should be delivered to the inbox, sent to the spam folder, or rejected altogether. Your sender reputation plays a significant role in these decisions.

Your sender reputation is based on various factors, including:

• Email Engagement: ESPs monitor how recipients interact with your emails. High open rates, click-through rates, and low bounce rates signal positive engagement, while high spam complaints and unsubscribes can harm your reputation.
• Sending History: The volume and frequency of your email sends, as well as any past spam or abuse reports, are considered when assessing your reputation.
• Authentication: Properly configuring authentication protocols like SPF (Sender Policy Framework) and DKIM (DomainKeys Identified Mail) can help verify the authenticity of your emails.
• List Quality: Sending emails to a clean, opt-in list of recipients who have explicitly requested your emails is crucial. Purchased or rented email lists can damage your sender reputation.

To maintain a positive sender reputation, send relevant and engaging content to your subscribers, regularly clean your email list, and promptly address any spam complaints or unsubscribe requests.

Email Content and Design

The content and design of your emails also impact deliverability. ESPs use spam filters to analyze the content of incoming emails and decide whether they should be flagged as spam. To improve your email’s chances of reaching the inbox:

• Avoid Spam Trigger Words: Certain words and phrases like “free,” “buy now,” and “guaranteed” are commonly associated with spam. Limit their use in your subject lines and email content.
• Balanced Text-to-Image Ratio: Emails with too many images and minimal text can trigger spam filters. Aim for a balanced text-to-image ratio.
• Personalization: Personalized emails that address recipients by name and provide relevant content are more likely to bypass spam filters.
• Unsubscribe and Contact Information: Include a clear way for recipients to unsubscribe and provide your contact information to build trust.
• Mobile Responsiveness: Ensure that your emails are mobile-responsive, as many people check their emails on mobile devices.

Email Authentication

Email authentication protocols like SPF, DKIM, and DMARC play a significant role in email deliverability. They help verify the authenticity of your emails and protect against spoofing and phishing attacks.

• SPF (Sender Policy Framework): SPF records specify which mail servers are authorized to send emails on behalf of your domain. Ensure that your SPF record is correctly configured to prevent unauthorized senders.
• DKIM (DomainKeys Identified Mail): DKIM adds a digital signature to your emails, allowing the recipient’s email server to verify that the email hasn’t been tampered with during transit.
• DMARC (Domain-based Message Authentication, Reporting, and Conformance): DMARC builds on SPF and DKIM by providing policies for how receivers should handle emails that fail authentication. Implementing DMARC can help protect your domain’s reputation.

Properly configuring these authentication protocols is crucial for improving email deliverability and ensuring that your emails are not marked as suspicious or fraudulent.

IP Reputation

The IP address from which you send emails can also affect deliverability. If you share an IP address with other senders, their behavior can impact your reputation. Here are some key considerations:

• Dedicated IP vs. Shared IP: Using a dedicated IP address can give you more control over your sender reputation. Shared IPs are often used by email service providers and can be influenced by the actions of other users.
• Warm-up Period: If you’re using a new IP address or domain, it’s essential to warm it up gradually by sending a small volume of emails and gradually increasing it. This helps establish a positive reputation.
• Monitoring and Maintenance: Regularly monitor your IP’s reputation and address any issues promptly. Some tools and services can provide IP reputation monitoring and management.

Email List Quality

The quality of your email list plays a significant role in email deliverability. Sending emails to recipients who have not explicitly opted in or who have become disengaged can lead to spam complaints and lower deliverability rates. To maintain a high-quality email list:

• Use Double Opt-In: Implement a double opt-in process, where subscribers confirm their email addresses after signing up. This helps ensure that only genuine subscribers are added to your list.
• Segmentation: Segment your email list based on factors like engagement, location, and preferences. Sending targeted emails to specific segments can improve engagement and deliverability.
• Regular List Cleaning: Remove inactive subscribers and regularly clean your list to eliminate invalid or bounced email addresses.
• Preference Center: Offer subscribers a preference center where they can update their email frequency and interests, reducing the likelihood of unsubscribes or complaints.

Email Volume and Consistency

The volume and consistency of your email sends can also impact deliverability. ESPs monitor how frequently you send emails and the volume of emails sent from your domain or IP address. Sudden spikes in email volume or erratic sending patterns can trigger spam filters. To maintain a healthy sending reputation:

• Gradual Ramp-Up: If you plan to increase your email volume, do so gradually to avoid triggering spam filters.
• Consistent Sending Frequency: Maintain a consistent sending frequency, so recipients know when to expect your emails.
• Avoid Sending Blasts: Sending a large email blast to a massive list can raise red flags. Instead, send targeted and relevant content to smaller segments of your list.

Spam Complaints

High spam complaint rates can severely harm your sender reputation and email deliverability. Recipients can mark your emails as spam if they find them irrelevant or if they didn’t explicitly subscribe to your list. To reduce spam complaints:

• Clear Opt-In Process: Ensure that subscribers explicitly opt-in to receive your emails, and provide a confirmation email as part of the double opt-in process.
• Easy Unsubscribe: Make it simple for recipients to unsubscribe from your emails. Compliance with unsubscribe requests is essential to maintain a positive reputation.
• Relevant Content: Send content that aligns with what subscribers signed up for. Avoid sending unrelated or excessive promotional emails.

Blacklists

Email blacklists are databases maintained by various organizations that track IP addresses and domains known for sending spam. Being listed on a blacklist can result in your emails being blocked or sent to spam folders. To avoid blacklisting:

• Monitor Blacklists: Regularly check email blacklist databases to see if your domain or IP address is listed. Many email delivery tools provide blacklist monitoring.
• Identify and Address Issues: If you find your domain or IP on a blacklist, take immediate action to identify and resolve the underlying issues.
• Maintain a Clean List: A clean email list with engaged subscribers is less likely to trigger blacklisting.

9. Feedback Loops

Some ESPs offer feedback loops (FBLs), which allow you to receive notifications when recipients mark your emails as spam. Subscribing to FBLs can help you identify issues and promptly address them. By processing these complaints and removing offending email addresses, you can maintain a positive sender reputation.

Conclusion

Email deliverability is a complex and multifaceted aspect of email marketing, influenced by various factors. By understanding and addressing these nine factors—sender reputation, email content and design, email authentication, IP reputation, email list quality, email volume and consistency, spam complaints, blacklists, and feedback loops—you can significantly improve your chances of reaching your recipients’ inboxes.

Remember that email deliverability is an ongoing process that requires constant monitoring and adjustment. As you implement best practices and maintain a positive sender reputation, your email marketing campaigns will become more effective, reaching the right audience and achieving your desired results.