What is deliverability, and what factors influence it?

• A. The ability to track opens and clicks.
• B. The ability of emails to reach the inbox; factors include sender reputation, authentication (SPF/DKIM/DMARC), content quality, list hygiene, sending frequency, and engagement.
• C. The percentage of emails that bounce immediately.
• D. The speed of email delivery.

Answer: (B)

Deliverability is about whether your emails actually land in the recipient’s inbox, not just reach a mail server. It depends on a mix of technical setup and reader behavior. Technically, sender reputation matters because ISPs judge you by your sending history and how often people engage with your messages. Authentication like SPF, DKIM, and DMARC proves you control the sending domain and helps you clear filters. Content quality and relevance also matter—clear, valuable content with proper formatting and avoided spam cues reduces the chance of being filtered. List hygiene is crucial: keep addresses clean, remove hard bounces, and re-engage or suppress inactive subscribers to maintain good performance. Sending frequency should be steady and respectful of readers, as overdoing it can drive complaints or unsubscribes. Engagement signals from recipients—opens, clicks, replies, and conversions—reassure ISPs that your emails are wanted and tend to improve inbox placement over time. In short, deliverability is about getting emails into the inbox, influenced by trust, proper authentication, message quality, clean lists, thoughtful cadence, and meaningful engagement.