The quality or ability of being successfully delivered, especially in reference to emails reaching inboxes or products arriving on time.
From 'deliver' (from Latin 'deliberare' meaning 'to set free') plus '-ability' (from Latin '-abilitas' meaning 'capable of'). The modern sense developed in early 2000s with email marketing, referring to message delivery rates.
Email marketers obsess over deliverability because even a perfectly written message is useless if it lands in spam—it's literally the difference between communication succeeding or silently failing.
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