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How to perform Manual Telnet Test

We’ve already discussed about verifying a DNS capability. In such a way, this is for testing Telnet manually. You can follow the following procedure with a variety of the Operating Systems comprising Windows, UNIX and Linux. Using this step, you can know to perform a mail transaction manually through Telnet. If there is any difficulty to receive the replies given, you can copy the entire transaction and save it to report the error you received. If you want to make this test useful, you can run it directly from the Mail Server. Generally, the OK codes begin with the 2nn while the Error Codes begin with 5nn. If you’re connecting to AOL and receiving the 554 RTR:SC, a 5nn error code indicates a number of problems. For an example, if a syntax error or AOL systems blocks the incoming connections due to lack of RDNS or excessive user complaints, you can follow the following steps to perform a mail transaction through the Telnet manually.



1.    In the Command prompt, Type:
telnet mailin-01.mx.aol.com 25
This command specifies to telnet to port 25 on an AOL mail host.

220
The mail host identifies itself. This should be accompanied by several lines of introductory text:

220-rly-mc02.mx.aol.com ESMTP mail_relay_in-mc02.5; Tue, 12 May 2009 14:17:08 -0400
220-America Online (AOL) and its affiliated companies do not
220- authorize the use of its proprietary computers and computer
220- networks to accept, transmit, or distribute unsolicited bulk
220- e-mail sent from the internet. Effective immediately: AOL
220- may no longer accept connections from IP addresses which
220 have no reverse-DNS (PTR record) assigned.
The greeting given is the standard that has been issued after any successful connection to the AOL mail system. You can get the text after you make the connection regardless of the state of the PTR record on the connecting IP.

2.    Type:

HELO yourdomainname.com
where yourdomainname.com
specifies your domain.

250 OK
followed by the server you are connecting to.
3.    Type:

MAIL FROM:
where you@hostname.com
indicates the address the mail should appear to be from.
Note: You must include the equality() signs

250 OK
4.    Type:

RCPT TO:
Note: You must include the equality() signs

250 OK
5.    Type:

DATA

START MAIL INPUT, END WITH "." ON A LINE BY ITSELF
6.    Type:

FROM:
where you@hostname.com
indicates the address the mail should appear to be from.
7.    You can type a brief message, followed by . (Type a period on a line by itself, then hit ENTER.)

250 OK

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