Fence Domain to avoid send business mails from personal accounts.
Avoid send an email to the wrong person or from the wrong account with "Domain Fencing”
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Vinícius Ferrão commented
It's relatively easy to implement like Postbox does. And it's a huge change when using multiple mail accounts.
Airmail would be my default email program if it had this feature.
Branislav V. commented
Postbox has this and it is super useful.
I often forget that while I am in Unified Inbox, then the From: address defaults to the one I have set and sometimes send a business email from my personal account, which is a bummer.