Mailbox unavailable. The server response was: 5.5.0 Invalid EHLO/HELO domain..

Products

• IT Management Suite

Issue/Introduction

While configuring e-mail settings, filling out the required information as shown in the screenshot below, and clicking on send test e-mail, you receive an error and the test e-mail is not received.

When reviewning the logs the following error is shown:

Test failed

Mailbox unavailable. The server response was: 5.5.0 Invalid EHLO/HELO domain..

 

 

Environment

Release : 8.x

Cause

There is some type of issue on the SMP server caused by an environmental configuration such as a firewall blocking ports, or other configuration settings.

Resolution

Possibly something blocking the port on the SMP server or something else environmental.  Had customer test email sending through PowerShell and it was failing there as well.

You can run a test using PowerShell to send a test e-mail message.  If it fails with the same error, you know the issue is isolated to something environmental and you should work with the team responsible for SMTP traffic.

Send-MailMessage -To "Enter Test E-mail Address Here" -From "[email protected]" -SmtpServer EnterTheFQDNoftheSMTPServerHere -Subject "PowerShell SMTP Test Message" -Body "This is a test"