Email Analyzer Tool — Check Provider, Domain & Quality Stats

Why provider mix predicts campaign behavior

Two lists of 5,000 addresses can behave nothing alike. One is 80% Gmail with aggressive tabbed filtering and strict spam thresholds; the other spans 400 corporate domains each with their own gateway rules, throttling and acceptance quirks. The Analyzer quantifies that difference: provider share, top registrable domains, TLD spread, average local-part length, plus quality signals for role accounts, disposables and plus-tags.

Use the breakdown to set expectations before you send. Consumer-heavy lists need tighter subject-line discipline and list-unsubscribe headers; B2B-heavy lists need slower ramp-up, per-domain throttling awareness and extra attention to role-account routing. Skipping this step is how teams misread a deliverability problem as a content problem.

Metrics the analyzer reports

Totals and uniques with duplicates removed, provider breakdown (Gmail, Outlook, Yahoo, corporate and long-tail), TLD distribution, top registrable domains with counts, role-account and disposable totals, plus-tag frequency and obfuscation recoveries. Every figure is computed on-device in a Web Worker; neither the list nor the report leaves your browser.

Read top-domain concentration first. If three domains hold 60% of the list, those three postmasters effectively decide your sender reputation. Then check disposable and role share — both above a few percent argues for a validation pass before any send. Plus-tag volume is usually benign segmentation signal, not a quality defect.

• Provider share → filtering behavior and engagement windows
• Top domains → who actually controls your deliverability
• TLD spread → geographic and abuse-pattern hints
• Role/disposable counts → whether to validate before sending

From analysis to segments

A practical segmentation: consumer mailboxes (Gmail, Outlook, Yahoo, iCloud) in one stream with consumer-tuned cadence; corporate domains grouped by the Domain Extractor's ranked table in a slower B2B stream; role and disposable addresses held out for confirmation. The Counter gives you the headline numbers for stakeholders while the Analyzer justifies the split.

Re-run analysis after every major list event — an import, a merge, a lead-magnet spike. Disposable share jumping from 1% to 6% after a giveaway tells you the incentive attracted throwaways, and you can quarantine that cohort before it drags engagement metrics down.

Analysis without uploads

Server-side analytics tools require the very thing you are trying to assess — your full contact list — to be transmitted and retained. Here the aggregation happens locally, so sensitive HR exports, client rosters and research corpora can be profiled without creating a second copy on someone else's infrastructure. The privacy property is architectural: there is no endpoint that could receive your data even if misconfigured.

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