Is Fastmail a Catch-All Domain? - BounceZero
It Depends - fastmail.com consumer vs custom domains on Fastmail

Is Fastmail a Catch-All Domain?

fastmail.com consumer
Not catch-all - individually verifiable
Custom domains on Fastmail
Frequently catch-all - Fastmail explicitly supports it

Fastmail's own domains (fastmail.com, fastmail.fm, etc.) are not catch-all. But Fastmail is popular among technical users who host custom domains, and Fastmail explicitly supports catch-all mailboxes on paid plans. BounceZero detects catch-all at the domain level and applies ML scoring where SMTP gives an accept-all response.

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G2
Listed
aws
AWS
Activate
Google
for Startups
NVIDIA Inception Program
NVIDIA
Inception
MongoDB
Atlas
Gartner
Gartner
Peer Insights
Product Hunt
Featured
RapidAPI
Marketplace
Datadog
Startup Program
UK Ltd Co.
No. 17153835

Fastmail Consumer Domains - All Verifiable

fastmail.com
fastmail.fm
fastmail.net
fastmail.org
fastmail.to
fastmail.cn

Fastmail Custom Domain Catch-All - A Common Setup

Fastmail's Standard and Professional plans allow custom domain hosting with catch-all mailbox configuration. This is explicitly documented and widely used - technical users and freelancers commonly configure catch-all on their personal domains hosted on Fastmail to receive all email regardless of which alias is used. When you encounter a custom domain MX-pointing to Fastmail's servers, there is a meaningful chance it is catch-all. BounceZero detects this with a test probe before classifying the address.

Frequently Asked Questions

Is Fastmail catch-all?

Consumer domains (fastmail.com, fastmail.fm, etc.) are not catch-all. But custom domains on Fastmail paid plans frequently enable catch-all. BounceZero detects both cases.

Does Fastmail support catch-all mailboxes?

Yes - Fastmail's Standard and Professional plans explicitly support catch-all mailbox configuration on custom domains. Many users enable it.

Are Fastmail addresses high-quality leads?

Typically yes. Fastmail attracts technical, privacy-conscious users. Valid Fastmail addresses tend to be from engaged, intentional users - lower risk than legacy freemail addresses.

How much does it cost?

$3 per 1,000 verifications. 100 free credits on signup - no credit card required.

Verify Fastmail Addresses - Consumer and Custom Domains.

Catch-all detection included on every domain. 100 free credits to start.

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Is [provider] a catch-all domain?

Per-provider answers - SMTP behaviour, detection methods, and how BounceZero handles each

Is GMX catch-all?

No - gmx.com/net/de all individually verifiable

Is Yandex catch-all?

Depends - consumer no, Yandex 360 custom domains often yes

Is Microsoft 365 catch-all?

~20% of M365 business domains have it enabled

Is Google Workspace catch-all?

~20% of Workspace domains have catch-all configured

Catch-All Email Verification 2026

What catch-all means, industry prevalence, risk scoring, send vs suppress guide

Is Gmail catch-all?

No - returns 550 for unknown addresses

Continue through related topics

Catch-all verification guide Email verification guide Email verification research

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