這時無法寄信,但是可以收信
很困擾,所以找了古歌
outlook出現錯誤訊息 Error 0x800CCC80 in Outlook Email Client
這時進入WHM
WHM >> Exim Configuration Manager >> Basic Editor >> click on Security 把這段關閉即可
Require clients to connect with SSL or issue the STARTTLS command before they are allowed to authenticate with the server