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paessler prtg invers

Monitor mail servers
with PRTG POP3 sensors


  • icon check white 2
    Ensure emails are sent –
    and retrieved – properly
  • icon check white 2
    Monitor server and mailbox
    response times
  • icon check white 2
    Special sensors for Microsoft Exchange mailboxes


Free Download

Unlimited use of PRTG for 30 days. After 30 days PRTG reverts to the freeware edition.
You can upgrade to a paid license at any time.







For companies,
email is as important as ever. If you’re an IT administrator, it’s therefore vital that you monitor your email infrastructure (e.g., mail servers) around the clock and without interruption. PRTG comes with sensors for the major protocols used for sending and retrieving emails.

In particular, two main protocols are used to retrieve messages from an email client: the Post Office Protocol Version 3 (POP3) and the Internet Message Access Protocol (IMAP). The difference between these protocols? POP3 downloads messages from the mail server to the recipient's computer. As a result, the email is only available locally in the POP3 mailbox. IMAP, on the other hand, downloads a copy of the email to the recipient’s computer and leaves the original message on the server.

PRTG Network Monitor keeps a constant eye on SMTP and POP3 as well as SMTP and IMAP so you can rest assured that your emails are being sent and received properly.


Free Download

Unlimited use of PRTG for 30 days. After 30 days PRTG reverts to the freeware edition.
You can upgrade to a paid license at any time.


Sensors for monitoring response and retrieval times

The SMTP&POP3 Round Trip  Sensor lets you monitor the sending and receiving of emails that originate in your system. It starts by sending an email to a given email address. This allows you to immediately see whether – and how fast – the email reaches the recipient, and how long it takes for the recipient to retrieve the email via POP3. If the delivery and retrieval are successful, then the email is automatically deleted.

If you simply wish to keep an eye on the response time of your mail server, then the POP3  Sensor is a good choice. The role of this sensor is twofold: it checks to make sure the corresponding threshold is not exceeded, and it sounds the alarm (via a notification) if a response time is too long compared to previous values.

 i What is a sensor?

In PRTG, “sensors” are the basic monitoring elements. One sensor usually monitors one measured value in your network, e.g. the traffic of a switch port, the CPU load of a server, the free space of a disk drive. On average you need about 5-10 sensors per device or one sensor per switch port.

View video (3:26 min.)



Monitor Microsoft Exchange Server
with PRTG


PRTG also comes with special sensors and a remote PowerShell feature for monitoring Exchange mailboxes. One such sensor, the Exchange Mail Queue (PowerShell) Sensor, monitors (among other things) the number of emails in the queue and the number of potentially malicious emails.

Meanwhile, the Exchange Mailbox (PowerShell) Sensor is crucial for ensuring the proper functioning of an Exchange Server. It shows you the number of emails in the monitored mailbox, the time of the last login, and the amount of memory being used by the mailbox on the server. A quick glance at the PRTG dashboard is therefore all it takes to determine whether the memory of a mailbox exceeds the defined limit.


Trusted by 500,000 users and recognized
by industry analysts as a leader


“Fantastic network and infrastructure monitoring solution that is easy to deploy and easier still to use. Simply the best available.”

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“Software is absolutely perfect, Support is superior. Meets all needs and requirements, this is a must have solution if you are needing any form of monitoring.”

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“The tool excels at its primary focus of being a unified infrastructure management and network monitoring service.”

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Free Download

Unlimited use of PRTG for 30 days. After 30 days PRTG reverts to the freeware edition.
You can upgrade to a paid license at any time.



PRTG in a nutshell


PRTG monitors your entire IT infrastructure

Traffic, packets, applications, bandwidth, cloud services, databases, virtual environments, uptime, ports, IPs, hardware, security, web services, disk usage, physical environments, IoT devices and almost everything you can imagine.

PRTG supports most technologies

SNMP (all versions), Flow technologies (i.e. NetFlow, jFlow, sFlow), SSH, WMI, Ping, and SQL. Powerful API (Python, EXE, DLL, PowerShell, VB, Batch Scripting, REST) to integrate everything else. See all PRTG features

PRTG is ready for every platform

Download for Windows and hosted version
available. Monitoring via AJAX Web Interface or Desktop Client.




Network Monitoring Software - Version (June 22nd, 2022)


Download for Windows and cloud-based version PRTG Hosted Monitor available


English, German, Spanish, French, Portuguese, Dutch, Russian, Japanese, and Simplified Chinese


Up to 100 sensors for free (Price List)

Unified Monitoring

Network devices, bandwidth, servers, applications, virtual environments, remote systems, IoT, and more

Supported Vendors & Applications

cisco logo grey 40 dell logo grey 40 hp logo grey 40 ibm grey40 netapp grey40 linux grey40 aws grey40 windows grey40 vmware grey40 citrix grey40 exchange grey40 apache grey40 oracle grey40


Still not convinced?



More than 500,000 sysadmins love PRTG

PRTG is used by companies of all sizes. Sysadmins love PRTG because it makes their job a whole lot easier.

Still not convinced?


Monitor your entire IT infrastructure

Bandwidth, servers, virtual environments, websites, VoIP services – PRTG keeps an eye on your entire network.




Free Download



Try PRTG for free

Everyone has different monitoring needs. That’s why we let you try PRTG for free. Start now with your 30-day trial.