Config: Add getSystemEmailAddress
Config: Add getSystemEmailAddress

The method returns the system's email address.

yona-projects/yona,bloodybear/yona,Limseunghwan/oss,Limseunghwan/oss,oolso/yobi,brainagenet/yobi,doortts/forked-for-history,brainagenet/yobi,brainagenet/yobi,Limseunghwan/oss,ihoneymon/yobi,bloodybear/yona,ahb0327/yobi,yona-projects/yona,naver/yobi,doortts/fork-yobi,bloodybear/yona,doortts/forked-for-history,naver/yobi,bloodybear/yona,doortts/forked-for-history,oolso/yobi,doortts/fork-yobi,ahb0327/yobi,yona-projects/yona,ahb0327/yobi,ihoneymon/yobi,oolso/yobi,yona-projects/yona,doortts/fork-yobi,ihoneymon/yobi,doortts/fork-yobi,naver/yobi