For personal I do not know
But for business emails
Give the list to gemini or chatgpt and ask to generate domains in another column
Then use that as a source
Prompt like, after the @ the remaining part is domain etc
Cold outbound from agencies only works if a company is already running ads on meta, google and tiktok etc if that brand is already running ads.
Do we have any way around to find it ?
If not, it is cool idea LOL !