Improving Email Deliverability: How to Reach Your Customers’ Inboxes

Email deliverability determines whether your messages—such as review requests, surveys, and campaigns—actually reach your customers’ inboxes or get filtered into spam. Strong deliverability ensures your communication is seen, improving engagement and response rates.

Email deliverability refers to where your email lands after it is accepted by the recipient’s mail server—ideally in the inbox rather than spam.

It’s important to understand the difference between delivery and deliverability:

Email delivery means your message has been successfully received by the recipient’s mail server. If it fails, it results in a bounce.

Common factors that affect delivery include:

Email deliverability focuses on inbox placement—whether your email reaches the primary inbox, promotions tab, or spam folder.

Even if emails are delivered, they may not be seen if they land in spam. Engagement signals like opens, clicks, and replies play a major role in determining this.

Several factors influence whether your emails reach the inbox and how your sender reputation is built over time:

If you're using a new sending domain or starting fresh, begin with smaller email volumes and increase gradually. This helps establish trust with inbox providers.

Before sending emails, ensure your contact lists are accurate and up to date. Remove:

Sending to poor-quality lists can negatively impact your deliverability.

Only send emails to users who have explicitly agreed to receive communication. Sending messages to non-subscribers can lead to higher unsubscribe rates and spam complaints.

Separating customers from marketing subscribers can help ensure you’re targeting the right audience.

Continuously sending emails to users who never engage can harm your sender reputation. Periodically clean your lists and exclude inactive contacts from campaigns.

Prioritize sending emails to users who regularly interact with your messages. Higher engagement improves your chances of reaching the inbox consistently.

A properly configured email setup helps build trust with inbox providers. This includes:

Always provide a clear and accessible unsubscribe option. If users can’t easily opt out, they are more likely to mark your emails as spam, which can significantly impact deliverability.

Your email content plays a key role in inbox placement. To avoid spam filters:

Relevant and meaningful content improves engagement and trust.

Sending too frequently can overwhelm users, while sending too rarely can reduce engagement. Adjust your sending frequency based on user behavior and preferences.

Run re-engagement campaigns for users who have stopped interacting. If they remain inactive, consider removing them to maintain a healthy and responsive audience.

Tracking performance metrics helps you understand how your emails are performing and identify potential issues early. Key metrics include:

These metrics directly influence your sender reputation and inbox placement over time.

Email deliverability is essential for ensuring your messages—whether review requests, surveys, or campaigns—reach your audience effectively. By maintaining clean lists, sending relevant content, and monitoring performance, you can improve engagement and consistently reach the inbox.