Yes. There are two ways to send files to non-Infinit users. You can either send files directly to an email address from the app or you can generate a link to any file. The link is automatically copied for you, so that you can then paste it anywhere (email, tweet, forum, etc.).
On Infinit's mobile apps, you'll also be able to enter a phone number (including a country code) and an SMS with a link to your shared files will be sent to your recipient.