A: Hello :)

YES! This web and desktop app made (& mean to) to reduce bounced emails by verifying your lists and maximize outreach.

About XLSX, we take comments and suggestions very seriously and can adopt new features into app within or less than a week. We'd like to invite you for a quick discussion via our live chat available on our website to discuss this further.
However, at the moment we support CSV, JSON and TXT formats.

Best