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No. Opt-in is legally required. Anyone could send an email claiming to be From the users address.


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You can send email from the Google Groups address using its web page (see the steps below; they're harder to find after the recent UI changes), but you're correct that Gmail won't accept a group as a "Send mail as" address. (If that ever changes, it's probably better to uncheck the "Treat as an alias" box.) To email from a Groups address: ...


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Found the answer with help from @Yisroel Tech Business (not regular) users have that checkbox option to uncheck "Include Default Groups Footer" and that will remove all footers when sent to subscribers in the same domain However, when someone outside the domain is subscribed (e.g., a forwarding address to get that message into Slack), the footer will ...


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Did you try unchecking this? But this is only available in paid G Suite accounts. For Google Groups on a free account, unfortunately, there is no option to remove it.


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