Incoming Queue Test

The cleanup service of the Postfix mail server writes all new mails into the incoming queue. Under normal conditions the incoming queue is nearly empty (has only mode 0600 files), with the queue manager able to import new messages into the active queue as soon as they become available. The incoming queue grows rapidly when the message input rate spikes above the rate at which the queue manager can import messages into the active queue. The main factors that are slowing down the queue manager are disk I/O and lookup queries to the trivial-rewrite service. If the incoming queue grows abnormally and is not emptied, then the new messages from the maildrop queue cannot be accommodated. In such cases, administrators may not know when exactly the incoming queue started growing and to which particular domain those messages were to be delivered. To have a fair knowledge on these issues, administrators can use the Incoming Queue test.

This test periodically monitors the incoming queue of the target Postfix mail server and reports the total size of the queue as well as the split up of the message count in terms of time duration i.e., the number of messages that were in the queue for a specified time duration.

Target of the test : A Postfix mail server

Agent deploying the test : A remote agent

Outputs of the test : One set of results for the target Postfix mail server being monitored

Configurable parameters for the test
Parameters Description

Test period

How often should the test be executed

Host

The host for which the test is to be configured.

Port

The port at which the specified host listens. By default, this is NULL.

UseSUDO

By default, this flag is set to False indicating that the test does not collect the queue related statistics, by default. If this flag is set to True, then the test uses the sudo command to collect the queue related statistics.

Timeout

Specify the duration (in seconds) beyond which this test should time out in the TIMEOUT text box. The default is 30 seconds.

Detailed Diagnosis

To make diagnosis more efficient and accurate, the eG Enterprise suite embeds an optional detailed diagnostic capability. With this capability, the eG agents can be configured to run detailed, more elaborate tests as and when specific problems are detected. To enable the detailed diagnosis capability of this test for a particular server, choose the On option. To disable the capability, click on the Off option.

The option to selectively enable/disable the detailed diagnosis capability will be available only if the following conditions are fulfilled:

  • The eG manager license should allow the detailed diagnosis capability
  • Both the normal and abnormal frequencies configured for the detailed diagnosis measures should not be 0.

Measures made by the test:
Measurement Description Measurement Unit Interpretation

Queue size

Indicates the total size of the queue.

Number

An unusually high number of messages in the queue is indicative of any problem with the corresponding queue or its end points.

The Detailed diagnosis of this measure lists the message count for each domain.

Less than 5 mins

Indicates the number of messages that were in the queue for less than 5 minutes.

Number

 

Between 5-10 mins

Indicates the number of messages that were in the queue for a time duration between 5 to 10 minutes.

Number

 

Between 10-20 mins

Indicates the number of messages that were in the queue for a time duration between 10 to 20 minutes.

Number

 

Between 20-40 mins

Indicates the number of messages that were in the queue for a time duration between 20 to 40 minutes.

Number

 

Between 40-80 mins

Indicates the number of messages that were in the queue for a time duration between 40 to 80 minutes.

Number

 

Between 80-160 mins

Indicates the number of messages that were in the queue for a time duration between 80 to 160 minutes.

Number

 

Between 160-320 mins

Indicates the number of messages that were in the queue for a time duration between 160 to 320 minutes.

Number

 

Between 320-640 mins

Indicates the number of messages that were in the queue for a time duration between 320 to 640 minutes.

Number

 

Between 640-1280 mins

Indicates the number of messages that were in the queue for a time duration between 640 to 1280 minutes.

Number

 

More than 1280 mins

Indicates the number of messages that were in the queue for more than 1280 minutes.

Number

A high value for this measure is a cause of concern as it may indicate an impending problem with the domain to which the messages are destined to. The domain may either be too slow to accommodate all the messages or the domain may be down for a long period of time.