When your message is pertinent to every single person on the reply all.
I reply all to all work related emails because people will add someone who needs to be aware of what’s happening and I may not realize this is important to them. If they don’t want to be on the email they can ask me personally and I’ll take them off the chain.
I never reply all (or at all) to company update posts (e.g. new hires/promotions/other bs). If you want to congratulate them do it privately. The whole company doesn’t care.
When you want to unsubscribe from one of your company’s mailing lists but you don’t know how.
This does seem to be the correct reason, at least statistically speaking!
When everyone you’re replying to is a scammer that you added to that list to purposefully annoy them.
For conversations which include interested parts as recipients, it’s good to reply to all to ensure they get all the updates. But this goes for smaller groups. If you go beyond 7-10 recipients, it might be time to ask if everyone really wants this or if some other communication format would be preferrable (chat group or meeting).
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