---
title: "Blog — LeadSonar"
description: "Insights on outbound infrastructure, deliverability and pipeline growth from the LeadSonar team."
canonical: "https://leadsonar.io/blog"
last-updated: "2026-09-03"
---

> Insights on outbound infrastructure, deliverability and pipeline growth from the LeadSonar team.

LeadSonar [LeadSonar](https://leadsonar.io/)

Blog

# From the LeadSonar team

Insights on outbound infrastructure, deliverability and pipeline growth from the LeadSonar team.

[Blog](https://leadsonar.io/blog/)[Alternatives](https://leadsonar.io/alternative/)

### [B2B Contact Data Accuracy: How to Measure It and Why Most Lists Fail [2026]](https://leadsonar.io/blog/b2b-contact-data-accuracy/)

[B2B contact data accuracy is the share of records that are deliverable, complete, and current against a verifiable ground truth. Across a 37,040-contact file, 99.98% had a valid MX record and only 0.55% hard-bounced. Here is the audit you can run and the benchmarks to score it against.](https://leadsonar.io/blog/b2b-contact-data-accuracy/)

[July 14, 2026](https://leadsonar.io/blog/b2b-contact-data-accuracy/)

### [How to Build an Outbound List From Scratch: A Step-by-Step Workflow](https://leadsonar.io/blog/how-to-build-an-outbound-list-from-scratch/)

[A from-zero workflow to build an outbound list: define the ICP, source, enrich through an 18-20-provider waterfall at ~85% hit rate, grade by ICP fit, and verify deliverability inside one workspace that replaces 5+ point tools.](https://leadsonar.io/blog/how-to-build-an-outbound-list-from-scratch/)

[July 13, 2026](https://leadsonar.io/blog/how-to-build-an-outbound-list-from-scratch/)

### [How to Clean a B2B Email List (Without Killing Your Deliverability) [2026]](https://leadsonar.io/blog/how-to-clean-a-b2b-email-list/)

[A measured, step-by-step playbook for cleaning a B2B email list. Backed by first-party ground truth from a 37,040-contact sample where 99.98% had a valid MX record and only 0.55% hard-bounced when mailed.](https://leadsonar.io/blog/how-to-clean-a-b2b-email-list/)

[July 12, 2026](https://leadsonar.io/blog/how-to-clean-a-b2b-email-list/)

### [How to Improve Cold Email Deliverability (Data-Grade List Hygiene)](https://leadsonar.io/blog/how-to-improve-cold-email-deliverability/)

[Most cold email deliverability problems start in the list itself, before the sequencer ever runs. In a 37,040-contact outbound sample, 99.98% of addresses had a valid MX record and only 0.55% hard-bounced when mailed. Here is the data-layer workflow that produces those numbers.](https://leadsonar.io/blog/how-to-improve-cold-email-deliverability/)

[July 11, 2026](https://leadsonar.io/blog/how-to-improve-cold-email-deliverability/)

### [B2B Lead List Building: Best Practices Backed by Real ICP Data](https://leadsonar.io/blog/lead-list-building-best-practices/)

[The best practices for lead list building start with grade over volume. In a 103,000-contact B2B sample scored by LeadSonar, 40.6% earned an A ICP grade and over 91% qualified at B-or-better. Here is how to build a list that reads that way.](https://leadsonar.io/blog/lead-list-building-best-practices/)

[July 10, 2026](https://leadsonar.io/blog/lead-list-building-best-practices/)