This option came from Spree and we never used it. The config input field
is disabled in the admin interface and I checked our managed databases.
I don't think that we will want this feature in the future either.
Staging sends unmodified emails which is more realistic and we haven't
had a use case to intercept those emails. There's still the BCC option
if we need additional access.
This moves a step closer to having a simple and straightforward way to
configure the app's mail delivery which doesn't require to be a nuclear
engineer to troubleshoot mail issues.
It happens way too often that servers have mail config broken when
restarted or redeployed and it takes too much brain power to fix it. No
doubt; it's way too complex.
I chose to leave this page's form fields but "Send mails as" as
read-only. This other field is still used by instance manager to
troubleshoot mail issues.
