Validating SaaS idea by cold mailing businesses

I have an idea for an app that would help businesses who struggle with converting and transforming files.

An example would be: "I need to convert this excel sheet of leads into this specific XML format so I can import these leads into my CRM"

I know you can do this using chatGPT / Loveable / n8n,... but I'm looking towards building a solution for people who are less technical.

Now my question is, has anyone on here tried validating such a specific idea / problem by sending cold emails to businesses? If so, what was your experience and reply rate? Any tips are welcome