I've been using QuickMail for cold and warm email campaigns and honestly, there's no reason to shop elsewhere. First, just the weekly podcast that Jeremy runs is worth every penny. They have lots of tips/tricks and insight into the ever changing email landscape.
Within the quickMail system though - it's super easy and organized. There's a bit of trial and error with any cold email outreach but I'm consistently getting less than 5% bounces and more importantly, I get contracts signed every month. The tool is invaluable.
Beyond QuickMail - they also have a more indept course on cold email that I highly recommend, but isn't necessary. I've gone thru the course 2x (it's about an 8 week project) and I highly recommend it as well.
I'm obviously a big fan!!
QuickMail offers superior deliverability, advanced metrics, and multi-channel capabilities to help you get more replies from your campaigns without breaking the bank.https://quickmail.com