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1. #How to use telnet to test smtp communication in windows 7 how to#
2. #How to use telnet to test smtp communication in windows 7 code#

Any suggestion that may lead to solving our problem is appreciated.This document describes how to use telnet to perform a basic SMTP test from your local client through a configured listener on your Email Security Appliance (ESA) or Security Management Appliance (SMA). + a windows 2000 domain exist which consist of 3 Exchange servers ( 2 of the exchange 2000 & 3rd is exchange 2003 ) all of them are in one routing group send emails to the Local Bridgehead (Exchange 2000 server) & this server sends email to our Mail Relay Server (SMTP Server ,Windows 2003,also GFI Mailessential & Security exist on the server ) which resides in DMZ & finally this server sends emails to other SMTP servers Worldwide via ISA 2000 server which allows access to Mail Relay Server & all IP protocols are open for it. For more information, see Help and Support Center at. hello Mr.Akhlaghi we still have the same problem on our Mail Server: ******************************************************* Event Type: Warning Event Source: smtpsvc Event Category: None Event ID: 4006 Date: Time: 7:08:55 AM User: N/A Computer: GW Description: Message delivery to the host '209.191.88.247' failed while delivering to the remote domain '' for the following reason: The connection was dropped by the remote host. Hi i've a problem with our Smtp server which i hope that you can help. You now know how to manually create and send an SMTP message! This can be a great troubleshooting tool, as you will receive reponses and acknowledgements from the receiving system that can aid in diagnosing a communication problem.

If everything has gone well, the message will be on its way to the recipient address. This ends the Telnet session and you will be returned to the OS prompt. The receiving system will understand and return a prompt. Type a period (".") and press Enter - this marks the end of the message body. Type a blank line - this denotes the end of the subject and the beginning of the message body. Optionally, From:, To:, and BCC: can be entered at this time (to be covered in a future article).

#How to use telnet to test smtp communication in windows 7 code#

If is not a domain being fielded by the receiving system, and the system does not allow relaying to, an error code will be returned. If you are testing communications to an outside messaging system, you may need to use your actual domain name to be allowed to continue. It is a method to combat address spoofing and more reliably identify undesirable senders. Some receiving systems will compare the parameter from the ehlo command, and the domain listed in the address on the mail from: command to the domain name returned when performing a reverse DNS (RDNS) lookup on the IP address from which the message is coming. If not, double check the protocol named in the response to the telnet command. If you receive an OK message from the receiving mail system, proceed. If the receiving system understands ESMTP, you may begin with either helo or ehlo. If the receiving system only understands SMTP, you must begin with helo. There are two established protocols, SMTP and ESMTP (Enhanced SMTP). The acknowledgement should also indicate if it understands SMTP or ESMTP. If the receiving server is accepting SMTP communications, it will respond with an acknowledgement message indicating it is ready to receive your transmission. For more information about this, read this article. If you need to determine this information, you can use NSLookup if you know the SMTP domain name you are attempting to connect to. Telnet allows you to specify the port through which to communicate. This will show you the same information that your SMTP engine receives when communicating with an outside system. The best place to run Telnet is on the server which sends out your SMTP traffic.