From the LeadSonar team
Insights on outbound infrastructure, deliverability and pipeline growth from the LeadSonar team.
B2B Contact Data Accuracy: How to Measure It and Why Most Lists Fail [2026]
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.
How to Build an Outbound List From Scratch: A Step-by-Step Workflow
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.
How to Clean a B2B Email List (Without Killing Your Deliverability) [2026]
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.
How to Improve Cold Email Deliverability (Data-Grade List Hygiene)
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.
B2B Lead List Building: Best Practices Backed by Real ICP Data
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.