Identifying Email Service Providers (Google, Outlook, Others)
How CSVgo identifies email service providers and why segmenting Google, Outlook, and other inboxes improves deliverability and campaign performance.
Email service provider identification is a core part of the CSVgo workflow.
Instead of treating all inboxes the same, CSVgo automatically detects which provider handles incoming email for each address and groups them accordingly.
The Three Provider Groups
CSVgo classifies inboxes into three clear categories:
Google
Inboxes hosted on Google infrastructure, such as Gmail and Google Workspace.
These inboxes are commonly used by:
Startups
SMBs
SaaS companies
Modern B2B teams
Outlook
Inboxes hosted on Microsoft infrastructure, including Outlook and Microsoft 365.
These inboxes are common in:
Larger organizations
Enterprises
Traditional B2B companies
They typically apply stricter filtering rules.
Others
All remaining providers, including:
Custom mail servers
Regional providers
Legacy hosting setups
Industry-specific email infrastructure
This category captures inboxes that do not fall under Google or Microsoft.
How CSVgo Identifies Providers
CSVgo analyzes domain-level and mail routing signals to determine which provider is responsible for receiving email.
This happens automatically during processing.
No manual lookups or external tools are required.
Why Provider Identification Matters
Different providers:
Apply different spam filters
React differently to volume
Require different warm-up behavior
Produce different reply patterns
Sending blindly across providers often reduces performance.
Practical Benefits of ESP Identification
With provider data, you can:
Segment campaigns by provider
Delay Outlook sending during warm-up
Adjust volume and pacing
Test copy on one provider before scaling
Isolate deliverability issues faster
This turns deliverability into a controllable variable.
Removing the Need for External Tools
Without CSVgo, ESP identification usually requires:
Additional paid services
Manual domain checks
Spreadsheet filtering
Repeated exports and imports
CSVgo includes ESP identification by default.
Where This Data Appears
Provider information is available:
In analytics
In all relevant exports
As a filterable field in downstream tools
This ensures provider data remains usable throughout your workflow.
Key Takeaway
Identifying email service providers allows you to:
Send smarter, not harder
Protect sender reputation
Improve inbox placement
Increase reply rates
CSVgo makes ESP segmentation automatic, accurate, and fast.