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In my experience working for tech startups for the last 5 years that have had between 10-5000 people, your assumptions are correct. Emails are only used for external communications and for receiving Jira/Confluence/CI/GDocs/etc notifications. Nobody sends emails internally, all communication is over Slack.

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Even a notice of resignation?

Yes. In my experience earlier this year, all HR, Accounts and Legal comms with the company was over Discord, except for some onboarding for new people at the beginning. No email was used at the end.

They had good departments with high quality staff and professional quality comms (considering it fit in Discord) in each of those too.

Emails were used for automated notifications though, such as GitHub, Expensify and BambooHR notices. But not the human messages.

Come to think of it, I'm not even sure how I would have found my colleagues email addresses to send them anyway. I didn't know my manager's email.

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