I don't do cold emailing a lot and if I have to I do manually. I tried using a couple of the same services before but I wasn't satisfied and didn't find worth it of upgrading to a paid plan.

I didn't have a plan of using such software any time soon until I came across MailRush.io on Appsumo. After playing around a little with it, I find it very intuitive and easy to use. Can't wait to explore more of its features.

What a great deal!