Email deliverability is the ability of your emails to actually reach recipients’ inboxes rather than getting blocked, bounced, or sent to spam folders. This is determined by your sender reputation, email authentication setup, engagement rates, spam complaints, and adherence to inbox provider guidelines. Good deliverability means 95% or more of your emails are reaching inboxes. Bad deliverability means a significant portion of your list never sees your emails even though they technically delivered. Deliverability is one of the most overlooked aspects of email marketing but it determines whether your entire email program works or fails.
What Kills Deliverability
Deliverability problems happen when you send from an un-warmed domain, when you have high spam complaint rates because people don’t remember opting in, when your engagement metrics are terrible because you’re emailing unengaged subscribers, when you’re hitting spam triggers in your content, or when your technical setup is missing proper authentication. Buying email lists or scraping contacts is a fast track to destroying deliverability because those people never opted in and will mark you as spam. Even with legitimate lists, if you’re emailing people who haven’t engaged in months, their inbox providers will start filtering your emails to spam because they’re learning those recipients don’t value your emails.
Protecting And Improving Deliverability
Maintaining good deliverability requires technical setup like SPF, DKIM, and DMARC authentication, list hygiene practices like removing unengaged subscribers regularly, engagement-focused strategies like re-engagement campaigns and segmentation, and monitoring your sender reputation and spam complaints. You also need to make sure people remember opting in by using double opt-in and sending welcome sequences immediately. The businesses with the best deliverability treat their email program like a privilege that can be lost, not a right. They’re obsessed with engagement, they clean their lists aggressively, and they monitor deliverability metrics religiously.