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Step-by-step guide

1. Setup → Services → HTTP, TCP, EMail, ... → Check Email → Add Rule
   
   

• Service description

Here you can type in a service description. Please

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ensure this is unique per host and does not collide with other services.

• Mail Receiving

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You can select if you want to check your IMAP or POP3 login.

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It would be best to have your login credentials for your

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Email Mailbox.

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• Forward

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• emails as events to Event Console
  
  

  • Forwarding Method
    

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• • 
    You can select if you want to send the events

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• • to the

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• • Event Console or

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• • a remote syslog host. If you want to send the events to the local EC, we

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• • recommend using the spooling mechanism.
    

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• • 
    The check will store all collected

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• • events in one file in ~/var/mkeventd/spool using the spooling mechanism.

    
    

    Code Block

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• • language bash theme RDark

    OMD[

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• • mysite]:~$ ll ~/var/mkeventd/spool/

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• • total 3600

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• • -rw-rw---- 1

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• • mysite mysite 79124 Dec 7 15:36

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• • mysite_407343_1607351778

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• • -rw-rw---- 1

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• • mysite mysite 79124 Dec 7 15:37

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• • mysite_408329_1607351841

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• • Only process mails with matching subject

Use this option to not process all messages found in the inbox

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but only

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those whose subject matches the given regular expression. The text entered here is handled as a regular expression pattern. The pattern is matched from the beginning. Add a tailing $ to change it to a whole text match. The match is performed case-sensitive. Read more about regular expression matching in Checkmk in our official user

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guide.
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You need to be aware that a subject field could contain line breaks. This is depending on your mail client and mail gateway.

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You could check the raw email to find out how many line breaks you have

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Now you can use regex platforms like regex101.com to create a regex.

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For advanced

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debugging:
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1. 1. 1. 1. Copy the plugin to the local path.

            Code Block
            language bash theme RDark
            OMD[mysite]:~/lib/nagios/plugins$ cp check_mail ~/local/lib/nagios/plugins/

            .

         2. Add a print for the subject

            Code Block

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2. 1. 1. 1. language bash theme RDark
            for index, msg in sorted(mails.items()):

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3. 1. 1. 1. subject = msg.get('Subject', 'None')

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4. 1. 1. 1. print(subject)

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         2. Run the script manually

            Code Block
            language bash theme RDark
            OMD[

jph2

5. 1. 1. 1. mysite]:~/lib/nagios/plugins$ ./check_mail --pwstore=6@17@password_1 '--fetch-protocol=IMAP' '--fetch-server=imap.strato.de' '--fetch-tls' '--fetch-port=993' '--fetch-username=

mail@anastasios-thomaidis

6. 1. 1. 1. user@provider.

de

7. 1. 1. 1. com' '--fetch-password=*************' '--connect-timeout=10' '--forward-ec' '--match-subject=.*Incident.*\n.*assigned' =?utf-8?Q?Incident_INC000000XXXX_has_bee?= =?utf-8?Q?n_assigned_to_your_group_'XXXX= =?utf-8?Q?XXXXX'_=XXXXX:_Comuni?= =?utf-8?Q?XXXXX_-_Priority:_Low?= =?utf-8?Q?Incident_INC000000XXXX_has_bee?= =?utf-8?Q?n_assigned_to_your_group_'XXXX= =?utf-8?Q?XXXXX'_=XXXXX:_Comuni?= =?utf-8?Q?XXXXX_-_Priority:_Low?= Forwarded 2 messages to event console | messages=2

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• • Events: Syslog facility

Use this syslog facility for all created events.

• • Events: Hostname

Use this hostname for all created events instead of the

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mail server's name.

• • Limit the length of the mail body.

When forwarding

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mail from the mailbox to the event console, the body of the mail is limited to the given number of characters.

• • Cleanup messages

The handled messages (see subject matching) can be cleaned up by

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deleting them or moving them to a subfolder. By default, nothing is cleaned up.

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Debugging

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Event Console Log

In the log of the EC Event Console, you can see the processing messages from the spool file:

2020-12-07 12:51:18,078 [20] [cmk.mkeventd.EventServer] Processing message '<21>Dec 7 12:51:17 localhost Checkmk EC: Checkmk EC|Email to EC of Checkmk!'

2020-12-07 12:51:18,079 [20] [cmk.mkeventd.EventServer] Parsed message:

application: Checkmk EC

core_host:

facility: 2

host: localhost

host_in_downtime: False

ipaddress:

pid: 0

priority: 5

text: Checkmk EC|Email to EC of Checkmk!

time: 1607341877.0

Execute active Check manually.

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For debugging reasons, it could be useful helpful to run the check manually. Therefore, you need to open the service site of the E-Mail Email service and search for 'Service check command'. Now you can use the command for executing the check manually.

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OMD[

mysite]:~/lib/nagios/plugins$ ./check_mail --pwstore=6@11@strato '--protocol=IMAP' '--server=imap.provider.de' '--ssl' '--port=993' '--username=

user@provider.

com' '--password=*************' '--forward-ec' '--forward-method=spool:' '--match-subject=Checkmk EC' '--forward-facility=2' '--forward-host=localhost' '--cleanup=delete'
OK - Forwarded 0 messages to event console | messages=0

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For a detailed log, you can use --debug at the end of the command:

OMD[

mysite]:~$ ~/lib/nagios/plugins/check_mail --pwstore=6@11@strato '--protocol=IMAP' '--server=imap.provider.de' '--ssl' '--port=993' '--username=

user@provider.

com' '--password=*************' '--forward-ec' '--forward-method=spool:' '--match-subject=Checkmk EC' '--forward-facility=2' '--forward-host=localhost' '--cleanup=delete' --debug

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For more information, you can use --help

OMD[mysite]:~$ ~/lib/nagios/plugins/check_mail -

-help

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One alternative:

OMD[

mysite]:~$ lq "GET services\nColumns:host_name description check_command_expanded\nFilter: host_name = 

mysite\nFilter: description = Email"
localhost;Email;check_mk_active-mail!--pwstore=6@11@cmkmail '--protocol=IMAP' '--server=imap.strato.de' '--ssl' '--port=993' '--username=

user@provider.

com' '--password=****************' '--forward-ec' '--forward-method=spool:' '--forward-facility=2' '--forward-host=localhost'

OMD[

mysite]:~$ cd ~/lib/nagios/plugins/

OMD[

mysite]:~/lib/nagios/plugins$ ./check_mail --pwstore=6@11@cmkmail '--protocol=IMAP' '--server=imap.strato.de' '--ssl' '--port=993' '--username=

user@provider.

com' '--password=****************' '--forward-ec' '--forward-method=spool:' '--forward-facility=2' '--forward-host=localhost' --debug

The Event would look like this:

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