Rule one of infrastructure: your primary domain never sends cold email. This generates the lookalike domains that do.
Privacy: this tool runs entirely in your browser. Nothing you type leaves this page, nothing is stored, and nothing is sent to GrowthPal.
Cold email at volume always carries reputation risk; the entire point of sending domains is making that risk disposable. If a lookalike has a bad month, you retire it and warm another. If your primary domain has a bad month, your invoices, password resets and investor updates start landing in spam. Every domain this tool suggests should redirect to your primary site and carry full authentication before its first warmup send.
Tools check the plumbing. The message is what your market answers. Get your TAM mapped, your ICP broken down and 5 angles written for your buyers, free.