It Depends - each Workspace domain configured independently

Is Google Workspace a Catch-All Domain?

Many Workspace business domains have catch-all enabled. MX records are identical whether catch-all is on or off.

Google Workspace gives administrators a "Default routing" setting that acts as catch-all - accepting all email to the domain regardless of whether the recipient exists. You cannot detect this from the aspmx.l.google.com MX records, which are identical on all Workspace domains. BounceZero probes each domain individually to find out.

Detect Workspace Catch-All Free

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Listed

AWS

Activate

Google

for Startups

NVIDIA

Inception

MongoDB

Atlas

Datadog

Startup Program

UK Ltd Co.

No. 17153835

Gmail Is Not Catch-All - But Workspace Can Be

This is a critical distinction that trips up many marketers:

gmail.com (public)

Not catch-all. Google does not offer catch-all on the public gmail.com domain. Unknown addresses return a hard 550 rejection.

company.com on Workspace

May be catch-all. Workspace admins can configure "Default routing" to accept all email. Many do. Cannot be detected from MX records.

The B2B Verification Problem

In B2B email, virtually every contact has a corporate address - and the majority of corporate domains are hosted on either Google Workspace or Microsoft 365. Between them, Workspace and M365 host most of the world's business email. And between them, they account for the vast majority of catch-all domains you'll encounter in a B2B list.

A verification tool that checks SMTP but doesn't detect catch-all will mark many of these addresses as "verified" when they're actually unknown. BounceZero's per-domain catch-all detection runs on every address regardless of provider.

~20%

of Workspace business domains have catch-all enabled

Identical

MX records on catch-all and non-catch-all Workspace domains

scoring for catch-all domains gives you a risk estimate, not just "unknown"

Frequently Asked Questions

Is Google Workspace catch-all?

It depends on the domain's admin configuration. Many Workspace business domains have "Default routing" (catch-all) enabled. You cannot tell from the MX records - BounceZero probes each domain individually.

Is gmail.com catch-all even though it uses Google MX?

No. gmail.com does not offer catch-all. Unknown @gmail.com addresses return a hard 550. Only custom domains on Workspace can be catch-all.

How does BounceZero detect Workspace catch-all?

By probing each domain with a known-invalid test address. If aspmx.l.google.com accepts the probe, the domain is catch-all. BounceZero then applies ML scoring.

How much does it cost?

$3 per 1,000 verifications. 100 free credits on signup - no credit card required. Catch-all detection included on every domain.

Is Google Workspace a Catch-All Domain?

Gmail Is Not Catch-All - But Workspace Can Be

The B2B Verification Problem

Frequently Asked Questions

Is Google Workspace catch-all?

Is gmail.com catch-all even though it uses Google MX?

How does BounceZero detect Workspace catch-all?

How much does it cost?

Catch-All Detection on Every Workspace Domain - Automatically.

Is [provider] a catch-all domain?

Is Fastmail catch-all?

Is Microsoft 365 catch-all?

Catch-All Email Verification 2026

Is Gmail catch-all?

Is Outlook catch-all?

Is Yahoo catch-all?

Is Google Workspace a Catch-All Domain?

Gmail Is Not Catch-All - But Workspace Can Be

The B2B Verification Problem

Frequently Asked Questions

Is Google Workspace catch-all?

Is gmail.com catch-all even though it uses Google MX?

How does BounceZero detect Workspace catch-all?

How much does it cost?

Catch-All Detection on Every Workspace Domain - Automatically.

Is [provider] a catch-all domain?

Is Fastmail catch-all?

Is Microsoft 365 catch-all?

Catch-All Email Verification 2026

Is Gmail catch-all?

Is Outlook catch-all?

Is Yahoo catch-all?

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