[plant42]

There's no mention of using Google authentication anywhere other than after clicking the login or sign-up buttons and you get the oAuth permissions/Google login page.

Also, if you cancel the oAuth request, you get an internal server error:

http://www.outbound.io/oauth2callback?error=access_denied

[dhruvkaran]

We are working on a non-google signup flow. Most SMBs in our test group seemed to be ok with Google login. This has changed as our acquisition channel changed. Stay tuned for more updates.