from: 250 , sender OK - how exciting to get mail from you!

to: 250 , recipient ok

data: 354 go ahead

421 See http://smtpd.develooper.com/barelf.html The following SMTP error was encountered: 421 See http://smtpd.develooper.com/barelf.html Unable to send email using PHP SMTP. Your server might not be configured to send mail using this method.

smtp 설정은 맞게 한것 같은데.

이런 디버그 해보니 메세지가 뜨면서 메일전송이 계속 실패됩니다.

왜그러는걸까요 ㅠ

고수분들의 조언 부탁드립니다 ㅜ