How do Gmail tabs affect deliverability?
Gmail tabs organize the inbox but do not indicate deliverability failure:
Primary: Personal, conversational messages.
Promotions: Marketing and commercial content.
Social: Social network notifications.
Updates: Transactional messages, receipts, confirmations.
All tabs are inbox delivery. Your message was accepted and placed where Gmail predicts the user wants it.
Spam folder is the only true deliverability failure. That is where unwanted, suspicious, or harmful messages go.
The Promotions tab is a dedicated berth at the commercial pier. It is not quarantine.
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