Del iver ability measures whether your emails reach the right place. It’s not enough for an email to simply “be sent”—it might bounce, end up in the spam folder, or be placed in a secondary tab. Deliverability depends primarily on the reputation of your sending domain and how your recipients respond to your messages.

Why does it matter?

An email that doesn't make it to the inbox isn't read, and one that isn't read doesn't sell. Email providers decide where to place each message based on signals they gather over time. Some of the most common ones are:

• Data quality: Sending emails to invalid or abandoned addresses results in bounces.
• Engagement: If many recipients open and reply to your emails, that's a good sign; if they ignore them or report them as spam, that's a bad sign.
• Technical setup: Domain authentication records, such as SPF, DKIM, and DMARC, help prove that you are who you say you are.
• Note: Sudden changes in volume may raise suspicions.

The exact criteria used by each email provider are not public and change over time. What remains constant, however, is the principle: send relevant messages to those who want to hear from you.

Story mode

An online sports store sends the same promotion every week to its entire mailing list, including addresses that haven’t opened an email in years. Little by little, its emails start ending up in the spam folder—even for loyal customers like Lucía. The store cleans up its mailing list, stops sending emails to those who don’t engage, and segments its audience by interests. Over time, its emails start appearing in the main inbox again.

How to Use It with Data4Sales

Deliverability starts with good data and good segmentation. With Data4Sales:

• Identity Resolution merges duplicate records based on name, email, or phone number into a single customer record, so you don't have to contact the same person twice.
• Segment by behavior and lifecycle to send messages to those who are likely to open them.
• You use Flows that trigger based on what each customer does, rather than sending mass emails to your entire customer base.

Related terms

• Email marketing
• Bounce Rate
• Opt-in and opt-out
• Data Quality