Telnet pop settings for remote mail Control (1)

In terms of mail service, we can use the TELNET service for configuration and remote monitoring. Then we need to configure telnet pop. Now let's take a look at how to use TELNET to manually operate SMTP/POP to send and receive emails.

Note: manual input is represented in a blue font, and # is followed by a comment, which cannot be entered.
 

 
 

  
  
========= Calculate the BASE64 encoded username and password first, and use ============
  
  
[Crazywill @ localhost crazywill] $ perl-MMIME: Base64-e 'print encode_base64 ("crazywill ");'
  
  
Y3Jhenl3aWxs
  
  
[Crazywill @ localhost crazywill] $ perl-MMIME: Base64-e 'print encode_base64 ("mypassword ");'
  
  
BXlwYXNzd29yZA =
 
 

 
 

  
  
================================== Start the SMTP mail sending operation ================== ================
  
  
[Crazywill @ localhost crazywill] $ telnet smtp.163.com 25 # telnet to port 25
  
  
Trying 202.108.5.81...
  
  
Connected to smtp.163.com.
  
  
Escape character is '^]'.
  
  
220 163.com Coremail SMTP (Anti Spam) System
  
  
EHLO smtp.163.com # handshake :)
  
  
250-mail
  
  
250-PIPELINING
  
  
250-AUTH LOGIN PLAIN
  
  
250-AUTH = LOGIN PLAIN
  
  
250 8 BITMIME
  
  
Auth login # Start authentication telnet pop LOGIN
  
  
334 dXNlcm5hbWU6
  
  
Crazywill
  
  
334 UGFzc3dvcmQ6
  
  
Mypassword
  
  
535 Error: authentication failed # login failure due to direct user name and password
  
  
AUTH LOGIN
  
  
334 dXNlcm5hbWU6
  
  
Y3Jhenl3aWxs
  
  
334 UGFzc3dvcmQ6
  
  
BXlwYXNzd29yZA =
  
  
235 Authentication successful # log on successfully using Base64 encoding
  
  
Mail from: <test@163.com> # MAIL sender
  
  
553 You are not authorized to send mail, authentication is required # mail cannot be forged
  
  
Mail from: <crazywill@163.com> # MAIL sender
  
  
250 Mail OK
  
  
Rcpt to: <crazywill@163.com>
  
  
# Recipient of the email. If multiple recipients exist, repeat this statement multiple times.
  
  
250 Mail OK
  
  
DATA # body content
  
  
354 Please start mail input.
  
  
TO: crazywill@163.com
  
  
# Here, the TO, FROM, and other content can be fake at Will :) you can lie, but you can't lie TO anyone who knows how TO view the mail source code.
  
  
FROM: cccc@163.com
  
  
SUBJECT: test by telnet/smtp
  
  
 
  
  
Test, just a test. # The Body of the email, which is written with a blank line from the Header.
  
  
. # After the email is completed, enter the result with a period.
  
  
250 Mail OK queued as smtp10, wKjADQ2ApxRnnqBE0CWaEw =. 38326S3 # If 250 is returned, the message is sent successfully.
  
  
NOOP # empty statement, which does not execute any operation. It is generally used to maintain connection with the server and do not drop the line
  
  
250 OK
  
  
QUIT # exit
  
  
221 Closing connection. Good bye.
  
  
Connection closed by foreign host.
  
  
[Crazywill @ localhost crazywill] $