Bug 921050 - Send email in the background.

While I believe this works out: the latest account matches the account used for outbox sending when data.emitNotifications is true because that was triggered on the currently configured account, it is probably worth calling that out in the comments.

Although, what might be more robust is to do a latestOnce on 'acctsSlice' and find the account that matches the account ID in the data object, just to make it clear we never get into a weird situation where someone starts an outbox send, then the account is switched before completion?