[Evolution] send in background

[Gary Curtin]

Having been a Thunderbird user for many years, in that application I
had set message sending to be in background. I am so used to starting a
new message after clicking send, that the delay while the message is
sent is causing me some frustration. I since selected to send messages
through Outbox folder, which reduced the time significantly, but there
is still some small delay before the compose window is closed.

Any idea how to improve on this with Evolution3.28.1-2 on Ubuntu 18.04?
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