Sorry, its a Windows only software, but you can try running it using a windows emulation software. It's most likely going to be your settings or email account. Gmail isn't really recommended since a lot of the registrations can end up in the spam folder. I personally use catchall emails from seremails.com but there is also seospartans or you can create your own. Also, some people use email accouints from mail.ru. I'd have to know more about your settings to see where you might have went wrong. The software can scrape them from search engines or you can import your own list or buy from a list seller.