How do ISPs view different subdomains under one root domain?
Separate tracking:
- Subdomains can build own reputation
- Engagement and complaints tracked per subdomain
- Different subdomains can have different standings
Root domain influence:
- Severe root domain issues may affect subdomains
- New subdomains may inherit some root reputation
- Not completely independent
Provider variations:
- Different providers weight root vs subdomain differently
- Gmail more granular in tracking
- Some may aggregate more
Practical effect:
- Subdomains provide useful isolation
- But not complete firewall
- Better than no isolation
Divisions of a company have their own performance records but the parent company reputation still matters.
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