Industries
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 outreach lists are guessed addresses at business domains, and about 28% of a B2B benchmark sat on catch-all domains. Segment those 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Campus addresses are shut off on a schedule after graduation, so an alumni list built on them is obsolete by design.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
Insurance contact is contractual as well as promotional, so an address that stops working can mean a client misses a renewal notice rather than a newsletter.
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 ever deciding to. Separate billing mail from marketing and compare churn to your bounce log.
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.
Run a sample through it
100 free checks a month, no card, and the unknowns come back labeled.