G2

Jeff J.

CEO, Founder

Small-Business (50 or fewer emp.)

9/23/2026

"Seamless Email Validation with Clear Pricing"

4/5

What do you like best about Kickbox?

I use Kickbox to clean the email list for StoryFolder, a video-storyboarding app I run as the founder. We had an older list of newsletter subscribers that hadn't been cleaned in years, and I wanted to check it before sending to it again. I ran an open-source SMTP checker first, then uploaded the addresses it couldn't get a verdict on to Kickbox as one CSV.

What I like best:

- Upload is drag-and-drop with a CSV, and the file processed quickly.

- Pricing is clear. I bought a 1,000-credit pack for $10 and each address used one credit, so I knew the cost before I started.

- The results file adds columns for result, reason, accept_all, disposable and role, so it was easy to join back to my own list.

- It gave verdicts where my local checker couldn't. Most of the addresses I uploaded came back deliverable, including Yahoo/AOL-family addresses that are hard to check any other way. A small number came back undeliverable, and I suppressed those before sending. Review collected by and hosted on G2.com.

What do you dislike about Kickbox?

Two things. First, my first checkout was flagged for a manual transaction review, which held up my credits. It was probably a mismatch between my business name and payment details. Kickbox support asked a few short questions and approved it quickly, but I couldn't use the service until they did, so it cost me roughly a day. A clearer notice up front about why a payment gets flagged would help.

Second, "risky" and "unknown" verdicts need judgment. Those two buckets were a small share of my batch, and the results give you the reason but not a recommendation, so you have to decide yourself whether to send to them. I chose to send to them, based on my own engagement history. A short guide to which reasons are safe to send to would make that easier. Review collected by and hosted on G2.com.

What problems is Kickbox solving and how is that benefiting you?

We struggled with a stale email list. Sending to it produced enough hard bounces that our sending platform's safety breaker kept pausing our campaign, which put our sender reputation at risk. Local checks left a few hundred addresses unresolved, mostly Yahoo/AOL-family mailboxes and hosts that block verification probes.

With Kickbox we got a verdict on those unresolved addresses in one upload. We suppressed the undeliverable ones and kept the rest. Our next daily send went out with no hard bounces in the early results, and the breaker stayed healthy. The benefit is a cleaner list, lower bounce rates, and less risk to our domain's deliverability, for about $10 in credits. Review collected by and hosted on G2.com.