Update: use APP_HOST env to send email host if there is one
Update: use APP_HOST env to send email host if there is one

CodeforOkinawa/ha4go,codeforkanazawa-org/ha4go,CodeforOkinawa/ha4go,CodeforOkinawa/ha4go,codeforkanazawa-org/ha4go,codeforkanazawa-org/ha4go,CodeforOkinawa/ha4go