Did Blind need permission from companies to use company email for signup?
If I have an app that is using the same functionality do I need to get permission from companies to use email for verification?
I doubt it. Secret used to be like Blind, but then savvier tech companies began filtering out Secret e-mails before they hit user inboxes, effectively stopping new people from registering with company e-mail addresses.
So, don't bite the hand that feeds.
You link your work email to LinkedIn (they send a link to your work email to verify). Then you can sign in with your LinkedIn. Although I don't think you can post with just a LinkedIn verification.
I doubt it. Secret used to be like Blind, but then savvier tech companies began filtering out Secret e-mails before they hit user inboxes, effectively stopping new people from registering with company e-mail addresses. So, don't bite the hand that feeds.
Which companies did that?
They also do LinkedIn verification. Companies can't ban LinkedIn registration with official email.