We're currently using a feature on github.com which allows us to enforce that email communications that come from github.com are only sent to the verified domain email[1] of a user. For example on my account I have slava@nextdoor.com and slavamarkeyev@gmail.com. When I recieve emails from github.com that relate to Nextdoor they are routed to my corporate email address. For security reasons we would like to do the same for CircleCi. Our developers shouldn't get notified by builds on their personal email account. The github api has functionality to get the domain email for a user [2].

[1] https://docs.github.com/en/free-pro-team@latest/github/setting-up-and-managing-organizations-and-teams/restricting-email-notifications-to-an-approved-domain

[2] https://github.blog/changelog/2020-05-19-api-support-for-viewing-organization-members-verified-email-addresses/