Email Address Validation Case Study

Here's how Hopewiser helped an organisation improve email deliverability through strategic bulk validation.

After years of collecting addresses through forms, competitions, and customer interactions, the UK‑based B2B brand had accumulated a decade‑spanning CRM database that had gradually become mixed‑quality, containing outdated, duplicated, and unverifiable email records

The Situation

The client began to experience deteriorating performance across their email marketing programme. Key issues included:

Low ROI, declining open rates and weak click‑through rates

A significant number of hard bounces from outdated prospect lists

An incident where sending to an old list led to the client being blacklisted by their email provider

Concern that their new email marketing platform would also restrict or suspend their sending capability due to poor data quality

Recognising the risks to their sender reputation, the client engaged our team to conduct a full review of their email data and implement a corrective strategy.

The Solution

Solution: Bulk Email Validation & Cleansing

To restore deliverability and protect the brand’s reputation, the client selected our bulk email bureau cleansing service. This approach ensured that all data was processed securely and systematically by the Hopewiser bureau team.

Key components of the cleansing service:

Deduplication of all email records

Validation and categorisation of every email address using specialist software

Clear reporting explaining each category and validation outcome

Ability to combine this project with wider data cleansing or enrichment

Options to suppress specific categories of emails based on client‑defined rules

Delivery of results either as a standalone clean file or reintegrated back into the client’s database with categorisation flags and status codes

After reviewing the available options, the client chose to:

Retain all emails marked “Success” (confirmed deliverable)

Retain all “Unverifiable” emails (from catch‑all servers where delivery is possible but cannot be definitively confirmed)

This gave the client a tailored balance between data quality and list retention.

The Result

Why the Client Chose Our Bureau Service

The client valued the flexibility and thoroughness of the bureau process. Specifically, they appreciated:

Included deduplication at no additional cost

Full control over which email categories were kept or suppressed

Clear, transparent categorisation and reporting

A tailored solution aligned to their internal marketing needs

Following the cleansing project:

The client’s email bounce rate dropped to below 1%, meeting the threshold required by their new email provider

Average open rates increased to 25%, significantly improving overall campaign effectiveness

The marketing team reported increased confidence in the reliability of their email database

The client adopted regular bulk email validation as part of their ongoing data hygiene process

Email Validation Case Study

Here's how Hopewiser helped an organisation improve email deliverability through strategic bulk validation.

The Situation

The Solution

The Result

Banks, Police Forces, and major Sports organisations trust us with their data validation. You can too.

Products

Integrations

Company

Developer Docs

We take security and privacy seriously

Email Validation Case Study

Here's how Hopewiser helped an organisation improve email deliverability through strategic bulk validation.

The Situation

The Solution

The Result

Banks, Police Forces, and major Sports organisations trust us with their data validation. You can too.

Products

Integrations

Company

Developer Docs

We take security and privacy seriously

Migrating from GetAddress.io?