About

In the high-stakes world of digital marketing, sender reputation is currency. A single campaign sent to a high bounce-rate list can trigger spam filters, blacklisting your domain across major ESPs (Email Service Providers). This Email List Cleaner is designed for rigorous Data Hygiene without compromising privacy.

Unlike server-side solutions where you upload sensitive customer data to a third party, this tool executes complex heuristic algorithms entirely within your browser's local memory. It parses raw text, CSVs, or mixed content to segregate VALID, RISKY, and INVALID contacts based on RFC 5322 standards, proprietary typo-correction logic, and an exhaustive database of disposable domains.

Formulas

The List Health Score (H) is calculated using a weighted penalty system against the Total Volume (N). This score determines the safety of sending a campaign to the unprocessed list.

{

H = 100 - ∑ P_iN × 100where P_i = Penalty Weight

Penalty Coefficients:

W_invalid = 1.0 (Critical Impact)

W_disposable = 0.8 (High Risk)

W_role = 0.2 (Low Engagement)

Reference Data

Category	Description	Impact on Deliverability	Typical Action
Valid (Corporate)	Structurally correct email on a private domain.	High	Primary Inbox Target
Valid (Free Provider)	Correct syntax on Gmail, Yahoo, Outlook, etc.	Moderate	Standard Engagement
Disposable / Temp	Domains like mailinator.com or 10minutemail.com.	Negative	Purge Immediately
Role-Based	Generic prefixes like admin@, support@, sales@.	Low	Segment / Re-verify
Syntax Error	Missing @, invalid characters, or malformed TLDs.	Critical	Hard Bounce (Block)
Typo-Squatting	Misspellings like gmal.com or outlok.com.	Critical	Auto-Correct or Reject

Frequently Asked Questions

Absolutely not. This tool runs 100% client-side using JavaScript. No file uploads to any server occur. Your customer lists remain strictly in your device's memory.

Disposable emails (or burner emails) are temporary addresses created to bypass sign-up forms without using a real identity. We cross-reference your list against a database of over 500+ known burner domains (e.g., mailinator.com, guerrillamail.com).

Addresses like "info@" or "admin@" are often distribution lists or unmonitored inboxes. They historically have low open rates and high complaint rates, which can drag down your overall sender reputation with ISPs.

We use a Levenshtein distance-based heuristic combined with a dictionary of common misspellings. For example, "[email protected]" is algorithmically identified as a likely typo for "gmail.com" and flagged for auto-correction.