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The shape of a bad list differs by where it came from. A scraped B2B prospecting list and a five-year-old ecommerce file fail in different ways.

Email deliverability: affiliate marketers

Affiliate lists are bought and traded, so spam traps and platform suspension matter more than bounce rate. A clean check proves only that addresses exist.

Email deliverability: B2B sales teams

Cold lists are guessed addresses at business domains, and about 28% of a B2B benchmark sat on catch-alls. Segment those rows and send to them last.

Email deliverability: digital agencies

An agency mails client lists it never collected, and one bad list can get the account carrying every other client reviewed. Set a list acceptance standard.

Email deliverability: dropshippers

A new store domain has no sending history, and discount popups on cold traffic draw disposable addresses. Warm the domain and strip disposables at capture.

Email deliverability: ecommerce stores

A customer who mistypes an address at checkout still completes the order, so the bad address syncs into your marketing platform. Validate at checkout.

Email deliverability: education institutions

Campus addresses are shut off on a schedule after graduation, so an alumni list built on them is obsolete by design. Capture a personal address early.

Email deliverability: event organizers

A joining link that lands an hour late is worthless. Send operational event mail on a separate path from promotion, and check sign-ups before it goes out.

Email deliverability: financial advisors

Advisors must retain client messages whether or not they arrive, and a client's work address dies at retirement. Capture a personal address at onboarding.

Email deliverability: fintech

Financial brands are the most spoofed senders in email, so DMARC at reject is a fraud control, not a delivery tactic. Check addresses at onboarding.

Email deliverability: healthcare marketers

In healthcare, one mistyped character can deliver patient information to a stranger's valid mailbox, and no checker catches it. Confirm with the patient.

Email deliverability: insurance brokers

A dead insurance address can mean a client misses a renewal notice, not a newsletter. Check your book before renewals, 1,000 addresses for $5.

Email deliverability: marketplaces

On a marketplace, a bad address breaks a transaction between a buyer and a seller, not a message from you. Monitor bounces per user, not per campaign.

Email deliverability: nonprofit fundraising

A long-time donor who never opens a newsletter looks just like a dead address in an engagement report. Compare giving history before you remove anyone.

Email deliverability: proptech

Proptech mail links tenants, landlords, agents and trade firms, and some notices are legally required. Validate any address that a third party typed in.

Email deliverability: publishers and media

Daily sends magnify every delivery problem, and Apple Mail proxy opens keep dead subscribers looking engaged. Build sunset rules on clicks, not opens.

Email deliverability: real estate teams

Real estate lists mix handwritten open house sign-ins with past clients from years ago. Capture digitally and check the back catalog before a campaign.

Email deliverability: recruitment firms

Every successful placement kills a work address in your database, so recruitment lists decay faster than any other kind. Always capture a personal address.

Email deliverability: SaaS companies

SaaS password resets often share a sending domain with marketing, so one bad import can block logins. Split the two streams and check addresses at signup.

Email deliverability: subscription boxes

When a failed-payment email bounces, the customer churns without deciding to. Split billing mail from marketing and verify addresses at checkout.

Email deliverability: travel companies

One traveler books for a whole party, so most passenger addresses came from someone else and carry no marketing consent. Separate booker from passengers.

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