It is needed to get a base64 encoding of your username and password to test SMTP AUTH. You can use the following perl command to do it.
arun@localhost [~]# perl -MMIME::Base64 -e 'print encode_base64("username");'
Eg: perl -MMIME::Base64 -e 'print encode_base64("arun\@sudosu.in");'
arun@localhost [~]# perl -MMIME::Base64 -e 'print encode_base64("password");'
Or
you can use single base64 code by using the following format.
# perl -MMIME::Base64 -e 'print encode_base64("username\0username\0password");'
dGVzdEBzdW5ueXZpc2lvbgB0ZXN0QHN1
In that case you have to use AUTH PLAIN command in telnet session instead of AUTH LOGIN as follows.
AUTH PLAIN dGVzdEBzdW5ueXZpc2lvbgB0ZXN0QHN1
The above commmands will return a base64 encoding of the username and password. You have to keep this code and use it while using telnet.
connect to the mail server using Telnet:
telnet mailserver.com 25
Then Greet the mail server:
EHLO mailserver.com
Tell the server you want to authenticate with it:
AUTH LOGIN
The server should have returned 334 VXNlcm5hbWU6; this is a base64 encoded string asking you for your username, paste the base64 encoded username you created earlier, example:
HPxcqYBx7TpirE4
Now the server should have returned 334 UGFzc3dvcmQ6;. Again this is a base64 encoded string now asking for your password, paste the base64 encoded password you created, example:
LOMjmzLk3fjrvZP
Now you should have received a message telling you that you successfully authenticated. Once the authntication is successful, you can send mail using the smtp server.
Here i am giving you a test telnet session.
arun@localhost [~]# telnet mailserver.com 25
Trying 1.1.1.1...
Connected to mailserver.com (1.1.1.1).
Escape character is '^]'.
220-server1.exampledomain.com ESMTP Exim 4.66 #1 Wed, 09 May 2007 23:55:12 +0200
220-We do not authorize the use of this system to transport unsolicited,
220 and/or bulk e-mail.
EHLO mailserver.com
250-server1.mailserver.com Hello [1.1.1.2]
250-SIZE 52428800
250-PIPELINING
250-AUTH PLAIN LOGIN
250-STARTTLS
250 HELP
AUTH LOGIN
334 VXNlcm5hbWU6
dXNlcm5hbWUuY29t
334 UGFzc3dvcmQ6
bXlwYXNzd29yZA==
235 Authentication succeeded
MAIL FROM: test@test.com
250 ok
RCPT TO: test@otherdomain.com
250 ok
DATA
Subject: My Telnet Test Email
Hello,
This is an email sent by using the telnet command.
Your friend,
Me
.
