A cold outreach campaign lives or dies on the first send. Blast a list full of malformed addresses, disposable domains, and shared role inboxes and you'll rack up bounces and complaints that scorch your sender reputation for months. Pre-send hygiene is the cheapest deliverability insurance there is.
This workflow shows how to run a cold list through layered checks - syntax validation, disposable-domain removal, and role-address filtering - so only clean, deliverable addresses reach your sending tool.
