: ----- The following addresses had permanent fatal errors -----
: (reason: 505 5.7.3 Client was not authenticated)
:
: ----- Transcript of session follows -----
: ... while talking to class6c.com.:
: >>> MAIL From:<kjn at interphos.com> SIZE=2435
: <<< 505 5.7.3 Client was not authenticated
: 554 5.0.0 <>... Service unavailable
음... 사용자 인증 에러 인거 같은데요~