How do I test SMTP authentication using telnet?

To test SMTP authentication via telnet:

  1. In a telnet client such as PuTTY, connect to the SMG appliance: telnet 587.
  2. Greet the mail server: EHLO
  3. Tell SMG you want to authenticate with it: AUTH LOGIN.
  4. Paste the base64 encoded username.
  5. Paste the base64 encoded password for the username.

How do I telnet to Exchange server on port 25?

Open the terminal and connect with the mail server using the telnet server name and access command — in the example above. Greet the server with EHLO or HELO, enter AUTH LOGIN, and wait for the computer’s response. Enter the base64-encoded user name and allow the server to answer.

How do I send an email using telnet 25 port?

How to send email using telnet

  1. Open your command prompt.
  2. Now, connect with telnet using the following command: telnet 25.
  3. Type ehlo
  4. Type mail from: [email protected]: mail from: [email protected].

How do I telnet to mail server?

1. Install the Telnet client

  1. Launch Server Manager.
  2. In the left pane, click Features.
  3. In the right pane, click Add Features.
  4. Check the box labeled Telnet Client and click Next. Note: Do not check the Telnet Server box.
  5. Click Install.
  6. Once the installation is complete, click Close.

What is SMTP in exchange?

The standard SMTP protocol is used to communicate to other Internet mail servers. Exchange Server is licensed both as on-premises software and software as a service (SaaS).

What is the outgoing mail server for Microsoft Exchange?

You can set your email client to access your Office 365 account using either Exchange or Internet Message Access Protocol (IMAP) settings….IMAP and SMTP with OAuth2 Server Settings.

Setting IMAP (incoming) SMTP (outgoing)
Server Name
Port Number 993 465 or 587

How do I test my SMTP email?

How to manually test if an SMTP server can receive email

  1. From the Windows Start Menu select Start->Run and enter CMD as the application to open. Select OK.
  2. At the command prompt, enter the following: telnet 25.
  3. Type the word QUIT and then press enter.

How do I Telnet to mail server?

Is exchange an SMTP?

The standard SMTP protocol is used to communicate to other Internet mail servers. Exchange Server is licensed both as on-premises software and software as a service (SaaS)….Microsoft Exchange Server.

Exchange Server 2019 logo
Developer(s) Microsoft
Operating system Windows Server
Platform x64
Type Collaborative software

How do I test my SMTP server for Office 365?

Test the Office365 SMTP Relay Service from PowerShell

  1. To open PowerShell right-click the start button and Choose Windows PowerShell.
  2. Enter the following command. $msolcred = get-credential.
  3. A window pops up.
  4. Then use the Send-MailMessage command to send a test email.
  5. If there is no error, check your inbox for a new email!

What is the SMTP server for Exchange Online?
Enter the server name and port. To send emails to Exchange Online, select Use TLS for SMTP….Configuring SMTP and POP3 for Exchange Online (Office 365)

Protocol Server name Port
SMTP 587
POP3 995

What is SMTP in Exchange?

How to use telnet to test SMTP communication?


  • Using Telnet to test email (SMTP) If you are troubleshooting email connectivity and email reciept issues,it may be necessary to test basic SMTP communication for the problem that you
  • Commonly Seen SMTP Error Codes
  • How to install Telnet with only one command?

    The minimum abbreviation for each parameter is shown in uppercase letters.

  • TELNET normally operates in transparent mode. In 3270 transparent mode,all full-screen capabilities of the remote host are functional at your local display station,but the PA1 key is the
  • The TELNET command supports IBM® 3270-type display stations.
  • How to configure a SMTP server?

    Configure the SMTP Service. From the Search charm, type IIS. Hover your mouse over one of the selections, and run the Internet Information Services (IIS) 6.0 Manager. Click Yes to the UAC Prompt. Expand to SMTP Virtual Server #1, right click and select Properties. General Tab: Set the IP Address to the server’s IP address.

    How to test email flow using SMTP commands?

    Destination SMTP server:

  • Source domain:
  • Sender’s e-mail address: [email protected]
  • Recipient’s e-mail address: [email protected]
  • Message subject: Test from Contoso
  • Message body: This is a test message