SMTP Test Tool – FAQ

This is the FAQ for the SMTP Test Tool.

Q: What’s going on here?

A: This is a web-based SMTP test tool. If you’re familiar with SMTP servers and how they work, you know that you can manually telnet into the SMTP server and issue commands like HELO and MAIL-FROM and RCPT-TO to send a test email or just see how the SMTP server responds to commands. This web-based tool makes it so you can run diagnostic sessions on SMTP servers over the web, rather than having to use telnet and issue manual commands, which can be cumbersome.

Q: Why would I need to use this?

A: If you’re having difficulty getting emails delivered by your SMTP server, it might not be readily apparent what the issue is, and you might find yourself writing test code to figure it out. With this tool, you can easily see what’s going wrong with an SMTP server. Perhaps your login credentials are failing. Perhaps the SMTP server has run out of disk space. Perhaps the SMTP account is throttling you because of pre-established sending limits. By looking at the exact SMTP server responses, you can easily troubleshoot an issue.

Q: How is this SMTP Test Tool related to GMass? If I’m a GMass user, do I need to test my SMTP server here?

A: This SMTP Test Tool was created by GMass, and can be used by GMass users, but it’s really for everyone, including non-GMass users. If you’re a GMass user and you’re using the unlimited email sending option by connecting your account to an SMTP server, and you’ve having difficulty connecting your SMTP account, this tool will help you troubleshoot. Even if you’re not a GMass user but are using an SMTP server and having difficulty, this tool will help you troubleshoot.

Q: I’ve found other SMTP testing tools on the web. What makes this one so special?

A: I believe I’ve created the world’s best web-based SMTP testing tool, because with my tool, you can:

  • Authenticate by IP or Username/Password.
  • Specify a port other than 25.
  • Choose from multiple security options, including SSL, TLS, and STARTTLS.
  • See the SMTP conversation happen live before your eyes, shown in an easy-to-read color-coded format.
Q: I’m specifying a Username and Password, but I noticed that in the SMTP session, the Username and Password look a lot different from how I’m entering them.

A: That’s because we base-64 encode your Username and Password before passing it into the SMTP server for validation. That’s part of the SMTP standard.

Q: The SMTP server I’m testing  authenticates by IP address instead of Username/Password. How can I run a diagnostics session?

A: Leave the Username/Password fields blank, and set your SMTP server to accept connections from this IP address: 52.35.85.201. That is the IP address used for outbound connections to the SMTP server that you specify.

Q: If I enter my SMTP Username and Password, is it safe?

A: Yes, it’s pretty safe. We don’t store any of the information entered to test an SMTP server. It simply passes through ephemerally to conduct the SMTP connection test, and then the information disappears from our server.

Q: What happens if my test is successful?

A: A successful test will result in a one-line email message being sent from the email address specified to the email address specified. To protect against this tool being used to send spam, the “test message” cannot be modified.

9 Replies to “SMTP Test Tool – FAQ”

  1. Faruk

    I’m getting error:
    ERROR: A call to SSPI failed, see inner exception. I think thats why emails aint going out.

    Anyone how to fix this?

  2. Jaspreet Gurjal

    What Username and Password to be used ……

    What is SMTP Server to be used

    Error- ERROR: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond 50.63.202.1:25

  3. cloves

    O suporte deveria ser mais claro no preenchimento do teste.
    Que usuário e senha é esse?
    O email remetente é sempre do gmail?
    Qual site colocar? se não tiver site?
    já fiz de tudo, só dá erro.

  4. Peggy

    The test says please wait. How long as it has been 30 minutes and I am still waiting to do a test. If the test doesn’t work how will the mass?

  5. Rajesh Varindani

    Please help with the below: My campaign is Stuck

    Campaign-level Error Description:
    Unable to connect to the SMTP server set for your account, mail.XXXXXXXXXXXX.XX. No connection could be made because the target machine actively refused it 162.214.3.101:26

  6. Michael

    Require a little help. This is the error I get after inputting my info to set up the SMTP.

    Your GMass request failed. Error details:
    No connection could be made because the target machine actively refused it 103.224.212.222:25 Try the SMTP Test Tool to troubleshoot the issue.

    SMTP Server: smtp.sendgrid.net
    Ports: 25
    Username: apikey
    Password:………….

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