无账户
MAIL FROM:<test@rmvbdy.com>
RCPT TO:2850965781@qq.com
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:<admin@cpoge.com>
RCPT TO:2850965781@qq.com
data
Subject: test message
test body