What is this?

This knowledgebase contains questions and answers about PRTG Network Monitor and network monitoring in general.

Learn more

PRTG Network Monitor

Intuitive to Use. Easy to manage.
More than 500,000 users rely on Paessler PRTG every day. Find out how you can reduce cost, increase QoS and ease planning, as well.

Free Download

Top Tags

View all Tags




I'm using SMTP Server: Local Queue Length sensor for monitoring an MS Exchange server. This sensor displays the number of messages in the mail queue. However, I want the sensor to turn red or yellow after it reaches a specifc number of messages, but I can't do it because I can't find a specific notification for doing it.

I will be grateful if somebody could help me to resolve this issue.

exchange queue sensor

Created on Aug 2, 2016 3:50:33 PM

4 Replies



When you're in the notification tab of the sensor, the threshold trigger should be what you're looking for :) It can be configured the way you need it.

Created on Aug 3, 2016 11:25:23 AM by  Stephan Linke [Paessler Support]



When I'm in the notification sensor, the threshold trigger only let me to send mail or open a ticket, doesn't allow me to set the sensor to yellow o red.

Created on Aug 3, 2016 2:31:09 PM



Ok, here I find the solution:


Just enable limits, and you can define warning and error limits.


Created on Aug 3, 2016 3:29:50 PM



Glad you found it :) Sorry, it was early in the morning in Germany, otherwise I would've replied :)

Created on Aug 4, 2016 5:57:59 AM by  Stephan Linke [Paessler Support]

Disclaimer: The information in the Paessler Knowledge Base comes without warranty of any kind. Use at your own risk. Before applying any instructions please exercise proper system administrator housekeeping. You must make sure that a proper backup of all your data is available.