PRTG Manual: POP3 Sensor
The POP3 sensor monitors an email server via the Post Office Protocol version 3 (POP3).
For a detailed list and descriptions of the channels that this sensor can show, see section Channel List.
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Consider the following remarks and requirements for this sensor:
Remark |
Description |
---|---|
SRP ciphers |
This sensor does not support Secure Remote Password (SRP) ciphers. |
Microsoft 365 mailboxes |
This sensor does not support Microsoft 365 mailboxes. If you want to monitor a Microsoft 365 mailbox, use the Microsoft 365 Mailbox sensor. |
IPv4 |
This sensor only supports IPv4. |
Performance impact |
This sensor has a low performance impact. |
The sensor has the following default tags that are automatically predefined in the sensor's settings when you add the sensor:
- mailsensor
- pop3sensor
For more information about basic sensor settings, see section Sensor Settings.
Setting |
Description |
---|---|
Timeout (Sec.) |
Enter a timeout in seconds for the request. Enter an integer. The maximum timeout value is 900 seconds (15 minutes). If the reply takes longer than this value, the sensor cancels the request and shows a corresponding error message. |
Port |
Specify the port that the sensor uses for the POP3 connection. The default port for unsecure connections is 110 and the default port for secure connections is 995. The actual setting depends on the server you connect to. Enter an integer. We recommend that you use the default value. If the connection is unsuccessful, try a different port number. |
Setting |
Description |
---|---|
Transport-Level Security |
Define how the sensor handles the security of the connection:
If the sensor connects to a server via StartTLS, the connection is first established without connection security. After the connection has been established, the sensor sends a certain command (StartTLS) over the unsecured connection to negotiate a secure connection via SSL/TLS. If the sensor does not use StartTLS, the negotiation of a secure connection happens immediately (implicitly) so that no commands are sent in unencrypted plain text. If no secure connection is possible, no communication takes place. |
Setting |
Description |
---|---|
POP3 Authentication Method |
Select the authentication method for the POP3 connection:
|
User Name |
This setting is only visible if you select User name and password or 128-bit MD5 hash value (APOP) above. Enter a user name for POP3 authentication. Enter a string. |
Password |
This setting is only visible if you select User name and password or 128-bit MD5 hash value (APOP) above. Enter a user name for POP3 authentication. Enter a string. |
Result Handling |
Define what PRTG does with the sensor result:
This option is not available when the sensor runs on the hosted probe of a PRTG Hosted Monitor instance. In a cluster, PRTG stores the result in the PRTG data directory of the master node. |
Setting |
Description |
---|---|
Primary Channel |
Select a channel from the list to define it as the primary channel. In the device tree, PRTG displays the last value of the primary channel below the sensor's name. The available options depend on what channels are available for this sensor. You can set a different primary channel later by clicking below a channel gauge on the sensor's Overview tab. |
Graph Type |
Define how this sensor shows different channels:
|
Stack Unit |
This setting is only visible if you select Stack channels on top of each other above. Select a unit from the list. PRTG stacks all channels with this unit on top of each other. By default, you cannot exclude single channels from stacking if they use the selected unit. However, there is an advanced procedure to do so. |
By default, all of these settings are inherited from objects that are higher in the hierarchy. We recommend that you change them centrally in the root group settings if necessary. To change a setting for this object only, click under the corresponding setting name to disable the inheritance and to display its options.
For more information, see section Inheritance of Settings.
Which channels the sensor actually shows might depend on the target device, the available components, and the sensor setup.
Channel |
Description |
---|---|
Downtime |
In the channel table on the Overview tab, this channel never shows any values. PRTG uses this channel in graphs and reports to show the amount of time in which the sensor was in the Down status |
Response Time |
The response time This channel is the primary channel by default. |
KNOWLEDGE BASE
What security features does PRTG include?