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ZeroBounce Boosts Email Validation Accuracy for Microsoft 365, Google Workspace and Enterprise Email Security Platforms

MARKETING

7/8/20262 min read

ZeroBounce now helps users find out much sooner whether many catch-all email addresses are valid or invalid.

ZeroBounce has rolled out a significant enhancement to its email validation platform, delivering faster and more decisive results for catch‑all email addresses, one of the most persistent challenges in email hygiene. According to the announcement, the update dramatically improves how ZeroBounce classifies catch‑all emails across Microsoft 365, Google Workspace, and secure email gateways (SEGs), reducing uncertainty and helping teams move campaigns forward with greater confidence.

Why Catch‑All Email Addresses Have Been a Long‑Standing Problem

Catch‑all domains accept messages sent to any address, whether the mailbox exists or not. This creates ambiguity: traditional validation tools often return inconclusive results, forcing marketers to choose between suppressing potentially valid leads or risking bounces that damage sender reputation.

Until now, resolving catch‑all addresses often required additional verification steps that could take up to 48 hours.

ZeroBounce’s update changes that.

Faster, More Accurate Validation, Without Extra Steps

The new enhancement allows ZeroBounce to classify many catch‑all email addresses as valid or invalid during standard validation, eliminating the need for delayed secondary checks.

This improvement applies to:

Microsoft 365 business domains
Google Workspace domains
Major secure email gateways (SEGs)

During internal testing, ZeroBounce saw the number of Microsoft 365 addresses flagged as catch‑all drop by more than 99.98%, giving customers far clearer results.

Founder and CEO Liviu Tanase emphasized the importance of both speed and trust: customers need reliable data quickly, and this update delivers both.

A Major Win for B2B Marketers and Sales Teams

Because Microsoft 365 and Google Workspace power a large share of global business email, the update is expected to have the greatest impact on organizations working with B2B contact data.

Benefits include:

Fewer inconclusive results
Faster list cleanup and segmentation
More confident decision‑making
Reduced risk of sending to invalid addresses
Improved sender reputation and deliverability

Teams can now validate lists more efficiently and launch campaigns sooner, without sacrificing accuracy.

Catch‑All Domain Intelligence Remains Intact

Even with faster classification, ZeroBounce still shows whether a domain is configured as catch‑all. The improvement simply means many individual addresses on those domains can now be validated decisively during the standard process.

This preserves critical domain‑level insight while eliminating unnecessary delays.

Available Now to All ZeroBounce Customers

The update is live and requires no configuration changes from users. It automatically enhances standard validation workflows for all customers worldwide.

ZeroBounce continues to validate nearly 1 billion email addresses per month and supports more than 600,000 customers, reinforcing its position as a leader in email validation and deliverability.

A Smarter, Faster Future for Email Validation

ZeroBounce’s catch‑all enhancement marks a major step forward for email hygiene, especially for teams relying on large B2B datasets. By reducing ambiguity and accelerating validation, the platform helps businesses operate with greater clarity, confidence, and efficiency.

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