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You are here: Home>> Troubleshooting>>Manual Telnet Test
There are a number of ways to manually perform a mail transaction through telnet. The following procedure should work under a variety of operating systems, including Windows, UNIX and Linux.
This section describes how to manually perform a mail transaction through telnet. If you do not receive the replies shown, copy the entire transaction and save it so that you can report the error you received. In order for this test to be useful, it must be run from directly from the mail server.
Generally OK codes start with 2nn and Error codes start with 5nn. An example of an error code would be if you connect to us and receive 554 RTR:SC .... A 5nn error code could indicate a number of problems, for example a syntax error or AOL systems blocking your incoming connections due to lack of RDNS or excessive user complaints.
To manually perform a mail transaction through telnet, perform the following steps: - From a Command prompt, Type:
telnet mailin-01.mx.aol.com 25
This 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.
This is the standard greeting text issued after any successful connection to the AOL mail system. This text will be shown after a connection is made regardless of the state of the PTR record on the connecting IP. Check to see if you have reverse DNS (rDNS).
- Type:
HELO yourdomainname.com
where yourdomainname.com
specifies your domain.
250 OK
followed by the server you are connecting to.
- Type:
MAIL FROM: <you@hostname.com>
where you@hostname.com
indicates the address the mail should appear to be from.
Note: You must include the equality(< >) signs
250 OK
- Type:
RCPT TO: <postmaster@aol.com>
Note: You must include the equality(< >) signs
250 OK
- Type:
DATA
START MAIL INPUT, END WITH "." ON A LINE BY ITSELF
- Type:
FROM: <you@hostname.com>
where you@hostname.com
indicates the address the mail should appear to be from.
- Type a brief message, followed by <Enter> . <Enter> (Type a period on a line by itself, then hit ENTER.)
250 OK The transaction should appear similar to the following:
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