[modify] mail.yml : default_charset utf-8 (#2436)
[modify] mail.yml : default_charset utf-8 (#2436)


shirasagi/shirasagi,ShinjiTanimoto/shirasagi,sunny4381/shirasagi,sunny4381/shirasagi,itowtips/shirasagi,tany/ss,MasakiInaya/shirasagi,mizoki/shirasagi,tany/ss,sunny4381/shirasagi,MasakiInaya/shirasagi,shirasagi/shirasagi,tany/ss,mizoki/shirasagi,itowtips/shirasagi,ShinjiTanimoto/shirasagi,ShinjiTanimoto/shirasagi,shirasagi/shirasagi,MasakiInaya/shirasagi,mizoki/shirasagi,sunny4381/shirasagi,itowtips/shirasagi,MasakiInaya/shirasagi,ShinjiTanimoto/shirasagi,tany/ss,mizoki/shirasagi,itowtips/shirasagi,shirasagi/shirasagi