SMTP Console for easy diagnosis and troubleshooting or verification of SMTP connections
The free SMTP-Console Tool help for diagnostics and makes it easy to troubleshoot and test SMTP connections without having to enter Telnet commands. It supports both open and secure (SSL/TLS) SMTP server connections.
The tool includes a built-in library of commands such as EHLO, MAIL FROM, RCPT TO, DATA. The free software SMTP-Console from SocketLabs for Windows can be downloaded here.
If there are problems establishing a connection or sending e-mails with an SMTP server, the error can be quickly diagnosed, the connection to the SMTP relay server can be checked and tested as follows.
SMTP errors with a mail server can be!
- The SMTP server does not send ?
- Communication to the SMTP server is blocked, firewall ?
- Why did the connection to the SMTP server fail?
- SMTP server with SMTP-Auth authentication ?
- How to set up SSL/TLS or STARTTLS encryption ?
- Does the server respond with the correct hostname ?
- The SMTP server responds with an error ?
SMTP Relay ConnectionTesting using SMTP-Console as Telnet Alternative
First you go to Actions – Connect in the menu to establish the connection to the SMTP server.
After the connection to the SMTP server has been established, a dialog can be launched by choose the EHLO or HELO command.
The SMTP server commands in the following order:
EHLO example.com MAIL FROM:<email@example.com> RCPT TO:<firstname.lastname@example.org> DATA Body Message i.e. hello this is s test message! . RSET QUIT
After DATA enter the body message, by ending with dot (.) on a line by itself, the email proceed to sent.
If the SMTP server requires authentication via STARTTLS, first open a connection to the server then go to Actions – Connect, then select StartTls and choose Commands – Helo with enter eg. HELO domain.com, now go to Actions – Login wille enter a valid user account in the User field and the password into the Password field, select AUTH-LOGIN as type. A test message can now send with run first Mail From then Rcpt To followed with Data. Enter the message and ending with dot “.” on a line by itself, finaly it appers the SMTP status code 200 Ok queued as <queue id>.
You’ll notice that the email doesn’t have sender’s email address in it.
How to Test SMTP Server using Telnet on Port 25
The Telnet client is available in Windows, but not activated by default from Windows 10 (not installed as a feature). The Telnet Client feature is easy installed from PowerShell.
Open PowerShell as administrator to add features.
Add-WindowsFeature -Name Telnet-Client
The earlier PowerShell command may be required.
Alternatively, the Windows CPL module can be used, this is done via the keys Win+R and enter
Telnet will use port 23 by default, you need enter a port number at the end of the open command. SMTP Server uses commonly the ports 25, 465, and 587.
Once you are connected to the SMTP server, Backspace and Delete do not work, which is unfortunate because getting the SMTP server to accept your instructions requires you to type in those Base64 values. If you make a mistake, press Return and start again.
C:\> telnet Microsoft Telnet> set localecho Microsoft Telnet> set logfile c:\temp\telnetlog.txt Microsoft Telnet> OPEN smtp.server.net 25 220 smtp.server.net ESMTP EHLO example.com 250-smtp.server.net 250-PIPELINING 250-SIZE 250-ETRN 250-STARTTLS 250-AUTH PLAIN LOGIN CRAM-MD5 DIGEST-MD5 250-ENHANCEDSTATUSCODES 250-8BITMIME 250 DSN MAIL FROM:<email@example.com> 250 2.1.0 Ok RCPT TO:<firstname.lastname@example.org> NOTIFY=success,failure 250 2.1.5 Ok DATA 354 End data with <CR><LF>.<CR><LF> Subject: test message from console hello this is a test message! . 250 2.0.0 Ok: queued as 98FCE1766 QUIT 221 2.0.0 Bye
You will see the message OK followed by an ID code. Your email has been sent. Check the Inbox of the email account that you sent the email to in order to confirm that the process worked.
A blank line is needed between the Subject and the message body. Enter the message and ending with dot (.) on a line by itself, finaly it appers the SMTP status code 200 Ok queued as
The optional NOTIFY command specifies the particular delivery status notification (DSN) messages (also known as bounce messages, nondelivery reports, or NDRs) that the SMTP is required to provide. In this example, you’re requesting a DSN message for successful or failed message delivery.
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