Telnet Test to Verify if Email Works

Situation – How does an admin user verify if email is flowing through Spambrella and Proofpoint?

Solution – It is always best to perform a test via telnet to ensure that mail flow is functional through Spambrella/Proofpoint servers to your mail environment. Below are some simple steps to ensure mail flow is functional.

How To Test If Email Is Working Through Proofpoint Using Telnet

  • Launch a command prompt in windows by clicking the WINDOWS key and type CMD then hit ENTER.
  • To test email flow you need to send a test email to an existing synced account in Azure as was done in STEP 2.
  • From the command prompt perform a telnet to connect to Spambrella/Proofpoint MX records. Depending on which stack you are located in, you may need to telnet to the European stack EU1 or the US stack, these are two different MX records as shown in STEP 5.
  • Type the following command in a command prompt and hit ENTER.

Proofpoint Essentials Telnet Instructions

  • You should be greeted with the following SMTP banner.

Proofpoint Essentials Telnet Instructions

  • Now you can enter the telnet strings that will allow you to test mail flow.
  • Type the following commands as highlighted with arrows on the screen below and then press ENTER. Each time you press ENTER, a return response will show up. Be sure that the MAIL FROM address is a public email address not found on Spambrella.

Proofpoint Essentials Telnet Instructions

  • The final line that indicates queued as 7070E40006C means that Proofpoint has received your email and is processing it.
  • You may now verify with the inbound logs of Spambrella if the email was received and delivered.
  • To access the logs in Spambrella click on Log Search and enter the options InboundAny and select the date and press Search.
  • A successful result will be indicated as listed below in the Log Search.

Proofpoint Essentials Telnet Instructions