@imgyf @alameenpd https://t.co/hu2rKnMjpw is great for researching prospects and you can also use it for sending your email campaigns. I'd argue they've surpassed Zoominfo now, I've done a bunch of side by side comparisons to compare the quality of their data.
I'd recommend moving away from Google emails for sending cold email campaigns. I'd suggest using something like: https://t.co/YwevrVnrTH for setting up your emails. It's cheaper and better. Deliverability is very good and you actually don't have any of the headaches of setting up all the DNS records.