Smtp manual command

As you may have noticed above, some codes are command-specific. Actually, only three of them, , , and can be a response to any SMTP command. Others can be categorized as positive and negative code can be considered as an intermediate response.

This is the list of standard response codes. It should be also mentioned that some SMTP servers can generate other three-digit codes. In this case, the SMTP client will have to interpret the first digit that must be in a range from 2 to 5 inclusive.

It denotes the essence of the response successful or not. In this example, the client received the code that said that one of the recipients is not available. Nevertheless, the transaction was not aborted like in the example below. And each server implements authentication before it lets the email in.

For the purpose of testing email sending, this way is better to cut twice. Mailtrap significantly simplifies the email delivery and allows you to test how your application sends messages.

And it is an essential part of email testing checklist. All the necessary credentials like port, authentication method, and so on are available. Also, there are ready-to-use integrations for most common programming languages and web frameworks. All you need it to copy-paste them into your app code. No issues related to improper configuration, authentication, or any sort of spamming real users are expected. For more on this, read the Mailtrap getting started guide. Table of Contents.

Sign Up Now Get a free Mailtrap account, set it up in 5 minutes and start testing your emails today! Sign Up Now. Mailtrap uses cookies to enhance your browsing experience, analyze traffic and serve targeted ads. By continuing to use our site and application, you agree to our Privacy policy and use of cookies. The server cannot verify the user response to VRFY. The message will be accepted and attempted for delivery.

The server confirms mail content transfer response to DATA. After that, the client starts sending the mail. 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. When a response is received by the server that opened the connection, it can tell whether the remote server accepted the command and is ready for the next one, or if an error occurred. The first digit X is particularly important to understand because it indicates the success or failure of the command that was sent.

Here are its possible values, and their meanings. Additional information, including descriptions of the second Y and third Z digits of SMTP reply codes is included in this section, and in sections 4. Successful response : mail1. Failure response : Connecting to mail1. Could not open connection to the host, on port Connect failed. ESMTP servers can advertise their capabilities during the initial connection. These capabilities include the maximum accepted message size and supported authentication methods.

We now have two basic requirements — the MX record for railsware. At this point, you can log in to the SMTP server. Use the following command to do it:. This command defines the address to which bounces are delivered. Some of the mail servers, including mail. Try Mailtrap for Free.

For the beginning, you need to define the address of a SMTP server. We have got some online services that can help you examine the SMTP server:. However, you are not allowed to define the port, enter password etc.