What this is
A catch-all email domain is configured to accept all incoming emails, even if the specific address does not exist.
Why it matters
Catch-all emails do not bounce during verification, but they are often risky and can hurt deliverability.
Example
If a domain is catch-all:
[email protected] → accepted
[email protected] → also accepted
Even if those inboxes don’t actually exist.
Why catch-all emails are risky
They may still bounce later
They often belong to inactive or unmonitored inboxes
They typically have lower engagement
They increase the risk of spam complaints
When you can send to catch-all emails
If you are sending low volume
If the contact is highly relevant
If you are testing cautiously
When to avoid them
When sending at scale
When your deliverability is already struggling
When list quality is uncertain
Best practice
Separate catch-all emails into their own segment
Send to them last or in smaller batches
Monitor performance closely
Expert insight
Catch-all emails don’t fail immediately — they fail over time through low engagement and hidden bounces.
Simple rule
High-quality list → safer to include some
Risky list → remove them
This one is powerful because:
Most users don’t understand catch-alls
It explains hidden deliverability risk
It gives your AI nuance instead of “send or don’t send”