# Interpreting Invalid Emails

Invalid emails should **never** be used for cold email sending.

Sending to invalid addresses:

* Causes hard bounces
* Damages sender reputation
* Lowers inbox placement for valid leads

CSVgo flags these emails so you can exclude them with confidence.

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### What “Invalid” Means

An email is marked invalid when:

* The domain does not exist
* The mailbox does not exist
* The server explicitly rejects the address
* The address fails multiple verification checks

These are not “maybe later” leads for email.\
They are confirmed non-deliverable.

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### What to Do Instead of Emailing Them

Invalid email does not mean a bad lead.

It simply means **email is the wrong channel**.

Better alternatives:

* LinkedIn connection requests and DMs
* Manual outreach via LinkedIn Sales Navigator
* Cold calling if phone data exists
* Enrichment through other data sources

CSVgo keeps the cleaned contact data so you can switch channels instantly.

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### Why Excluding Invalid Emails Improves Performance

Removing invalid emails:

* Reduces bounce rates
* Protects domain reputation
* Improves inbox placement for valid emails
* Makes campaign results more predictable

One invalid-heavy campaign can harm multiple inboxes.

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### Common Mistake to Avoid

Do not:

* Retry invalid emails later
* Mix invalid emails into test campaigns
* Assume invalid means temporary

Once marked invalid, treat the address as **email-dead**.

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### Key Takeaway

Invalid emails are not a loss.\
They are a **routing decision**.

Exclude them from email campaigns\
and move them to a channel that actually works.