Isn't there a way just to delete it, if you never use it?
A little note...: This issue hits the stage very often. I think if you would amount all issues, the votes become relevant... People don't search for existing issues before they open a new one...
We also miss this feature. Would be cool if we could send error notifications with SMTP A and all other mails via SMTP B.
We need this, because SMTP B has a payed contingent and A not, but A is not whitelisted.