Teams burn domains because they treat deliverability as a checkbox: set up SPF, send, hope. Deliverability is infrastructure: dedicated domains, warmup schedules, validation waterfalls, bounce monitoring, and auto-pause on spikes.
One bad week (bad list, aggressive volume, ignored bounces) can blacklist a domain for months. Recovery is slow and expensive.
Build deliverability monitoring into your outbound stack from day one. It is cheaper than recovery.