All these questions and more can be answered with a simple telnet test. Before we get started, be sure to open up our companion piece to this post: To Where are Bounce Messages Sent?
As a note, the commands used in the following examples as well as additional commands are covered in section 4. Most computers come pre-installed with a telnet client. Once a telnet client has been verified to be installed on the server we first need to find a mail server to log into.
This can be found with the following command for these examples port First we need to know what IP address the internet sees us as having. To find that we can use a website like:. With the IP address run the following command, where A. D is the IP address. So now that we have the MX record for port To do so, use the following command:. Something similar to the following should now be displayed:.
SMTP fully covers it, implementing something similar to the mechanism of delivering an actual letter in an envelope. The messages are sent directly to this server, which consequently delivers mails to their receivers. First, a telnet client has to be verified for the installation on the server. Then, you should search for a mail server to log in to.
You can use something similar to the following command:. For this, we should start with the IP address the Internet sees us as having. Once you figured out your IP address, run the following command, with T.
T standing for the IP address. We now have two basic requirements — the MX record for railsware. At this point, you can log in to the SMTP server. Having problems? Ask for help in the Exchange forums. On most versions of Windows, you'll need to install the Telnet client before you can use it. To install it, see Install Telnet Client. Network policies might prevent you from using the Nslookup tool to query public DNS servers on the Internet.
At a command prompt, type nslookup , and then press Enter. This command opens the Nslookup session. Type the name of the domain for which you want to find the MX record. For example, to find the MX record for the fabrikam. When you use a trailing period. Multiple MX records and different values of preference are used for load balancing and fault tolerance. In this example, we're going to use the following values. When you run the commands on your server, replace these values with ones for your organization's SMTP server, domain, etc.
The commands in the Telnet Client aren't case-sensitive. The SMTP command verbs in this example are capitalized for clarity. You can't use the backspace key in the Telnet session after you connect to the destination SMTP server.
If you make a mistake as you type an SMTP command, you need to press Enter, and then type the command again. Unrecognized SMTP commands or syntax errors result in an error message that looks like this: 5. This optional command lets you view the characters as you type them, and it might be required for some SMTP servers.
This optional command enables logging and specifies the log file for the Telnet session. If you only specify a file name, the log file is located in the current folder.
If you specify a path and file name, the path needs to be on the local computer, and you might need to enter the path and file name in the Windows DOS 8. The path needs to exist, but the log file is created automatically.
In this example, you're requesting a DSN message for successful or failed message delivery. This section provides information about the success and failure responses to the commands that were used in the previous example. SMTP servers respond to commands with a variety of numerical reply codes in the format of x.
0コメント