[Solved] How to test SMTP to send test mail?

Step1. 先開啟cmd, 輸入mail server (記得加入mail port 25)
telnet smtp.xxx.com 25

Step2. 與Mail server say hello
helo smtp.xxx.com

Step3.設定寄件者
mail from:dontreply@xxx.com

Step4. 設定收件者
rcpt to:xxx-asia@xxx.com

Step5. 設定寄件內容
data
subject: Test mail from MailServer.
test mail 20180709 173400
greenth

Step6. 輸入"."以結束信件內容
.

Step7. 離開Mail server
quit

Ref :
手動 telnet SMTP 寄信、手動telnet POP3 收信