# telnet localhost 25
Trying 127.0.0.1...
Connected to test-server.test-server (127.0.0.1).
Escape character is '^]'.
220 test-server.example-sec.local ESMTP
helo localhost
250 test-server.example-sec.local
mail from:user01@example.com
250 ok
rcpt to:user02@example.com
250 ok
502 unimplemented (#5.5.1)
data
354 go ahead
From: user01@example.com
To: user02@example.com
Subject: test
this is test.

.
250 ok 1184072108 qp 20747

502 unimplemented (#5.5.1)
quit
221 test-server.example.local
Connection closed by foreign host.

appendix

• Python Fabric vs ssh vs Ansible
• How to use proxy in Linux
• How to use sed command in Linux
• http with telnet
• Mail with telnet

Top#Appendix