When you write a new email from the Unified Inbox, BlueMail has to send it from one of your accounts. Default From in Unified Inbox is where you choose which one. It is handy if you have several accounts but send most of your mail from one of them.
Go to Settings | Global Settings | Advanced Features | Default From in Unified Inbox, then tap the account you want to send from. A check mark shows your choice, and the same account is listed under Default From in Unified Inbox on the Advanced Features screen, so you can see it at a glance.
Good to know
- It is a starting point, not a lock. To send one particular email from another account, tap your name and address at the top of Compose and choose a different one. See How to Choose a Different Account to Send from.
- It is not the similar-sounding setting at the top of the same screen. Default Account when Launching App decides which account BlueMail opens to, not which one you send from. See How to Set the Default Account When Launching the App?