At cold.email this is our current stack that we get good results with. Findymail.com, and Wiza for email finding and validation with 95% deliverability. Porkbun for domains for Sending Infrastructure
Clay + 4.1 nano for Copywriting
Python + Serper.dev + AI Web Researcher in Clay for list building and validation We are considering...
Icypeas api for linkedin scraping
Mailreach for placement tests