Email marketing for prospecting

Hi Bubblers.

I was just wonderig if you guys have recommendations for a platform to use for lead generation, i am in the process of starting a dev agency and plaforms like mailchimp do not allow prospecting (email people who are not subscribed to your campaign), this is a major issue and any recommended platforms would besuper useful.

Alterntively, maybe you guys could suggest plugins that I could use for email marketing that works similarly like Instantly.ai or Mailchimp