If your emails are not setup with SPF, DKIM and strict DMARC policies, you're going to have a problem.
it’s that simple.
You also need an SMTP that lets you send 1000+ emails/day without any hassles.
At FueltoFly, we set up 2 types of infrastructures you can use concurrently that run in parallel to your primary email.
Our setups are done through subdomains, for example if your primary email is email@example.com, we’ll set up outreach to send from firstname.lastname@example.org.