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”
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.