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by pbhjpbhj 3194 days ago
Basic version: you can sign up for internally shared services with an email account ending @company.name, the account gets sent a link to verify and give access.

But some @company.name addresses -- commonly support@ -- route the email responses to a publicly accessible page, eg a bug report.

So you sign up to Slack with that support@company.name email, get the link for access to the company Slack from the support website, Bob's your Uncle!