The solution works as intended, offering ease of use while ensuring that all data remains intact throughout the entire process. I have experimented with other solutions, but many of the emails resulted in bounces.

In contrast, this solution confirmed the validity of the emails, and they were indeed valid when I sent messages to them. It is difficult to identify additional requirements beyond this.

The process of uploading a CSV file and subsequently downloading the results is straightforward. Implementation is simple, and I did not find it necessary to contact customer support.

I have utilized this solution multiple times, and it requires no complex integration—just a basic upload.