smtp cmd 测试 smtp发送邮件 cmd发送邮件

无账户
MAIL FROM:<[e-mail]>
RCPT TO:[e-mail]
DATA
Subject: test message
test body
.

有账户
telnet smtp.mailgun.org 25
helo cpoge.com
auth login
YWRtaW5AY3BvZ2UuY29t 64位编码
cXE4NzIzMTg3NTc= 64位编码
MAIL FROM:<[e-mail]>
RCPT TO:[e-mail]
data
Subject: test message
test body