Personal Gmail or Professional domain email?

I'd really appreciate some advice for getting into outbound sales on the right foot.

I'm debating whether to using my personal Gmail account or registering a domain, specially for sale emails.
I plan on using an email warm-up service to build reputation and minimize chance of ending up in someone's spam folder.

So my question is, which type of email should I invest time into managing? Does a professional email make that much of a difference compared to a personal one?

Please let me know your experiences and opinions.

All the best everyone,
-M