# B2B Lead Quality: Sources, Deduplication & Freshness | WinLead AI

Useful leads need information that is credible, complete enough, relevant and recent. Check quality before scoring and outreach to reduce repeated work later.



## In this guide

- [Make every source easy to revisit](#section-1)
- [Use domains to help identify duplicates](#section-2)
- [Distinguish missing data from poor fit](#section-3)
- [Check when the information was verified](#section-4)
- [Understand the limits of email validation](#section-5)[All guides →](https://aihk.nailcloud.cn/en/resources/)

## Make every source easy to revisit

Preserve original URLs and collection times for company names, websites and contact information. Inaccessible sources, contradictory fields and mock records need review before any real outreach.

## Use domains to help identify duplicates

Normalize URLs and compare company entities. A shared domain is a useful clue, but corporate groups, subsidiaries and regional operations may need human judgment. Do not merge records based only on similar names.

## Distinguish missing data from poor fit

An unknown company size is not an unsuitable company size. Track missing fields and decide which must be enriched before scoring and which can be clarified in a conversation.

## Check when the information was verified

People change roles, businesses change focus and email addresses stop working. Retain collection and verification dates, and revisit stale records instead of repeatedly passing old information through automation.

## Understand the limits of email validation

Syntax checks establish only that an address has a plausible format. Domain and SMTP checks may be affected by server policies. Validation cannot guarantee delivery, replace permission or predict a reply.

Product reference: WinLead AI PRD V2.0. Roadmap goals are distinct from accepted capabilities. Real services require appropriate configuration.

[Explore the product workflow →](https://aihk.nailcloud.cn/en/product/)



## Does deduplication prevent every repeat contact?

No. Also check company-contact relationships, prior sending records, ownership and merge rules. Repeat checks when new records are imported.

## What is a mock lead?

A mock lead is sample data used for demonstrations or fallback flows. Its label must remain visible; it must not be presented as a real prospect or acquisition result.

Source: https://aihk.nailcloud.cn/en/resources/lead-quality/