Notifications are set to send SMTP via html email but if I do run fake check command, it tries with asciimail method to send email and fails with the below error. How to completely avoid checkmk to use asciimail method?

[Nagesh.n]

**CMK version: 2.2.0p17.cce
**OS version: ubuntu 22.0

**Error message: Unhandled exception: [Errno 2] No such file or directory: ‘/usr/sbin/sendmail’

Output of “cmk --debug -vvn hostname”: (If it is a problem with checks or plugins)

[Oliverr (Oliver)]

Hi,
Is email set up on the Linux?

Notifications - via Email, SMS, ticket system and more

[Nagesh.n]

Yes, the Email setup is done. I receive SMTP emails but often the service notification are sent with asciimail method instead of mail, which will fail to send a notification. how to completely stop assicmail method?

Also, when I run facke check command, it doesn’t sends out any notification.

[joerg.mohar]

“Fake Check Command” always set a Softstate. Depend on your check intervall setup you need to Fake the Check for more than 1 time to set the Hard State for Notifications.

When working on Notifications it is always good to tail the notify.log in “/opt/omd/sites/
/var/log/notify.log”. This is always a good starting point to analyse notification rulsets.

I tested the Fake Check…on my site an HTML Email is always send when this option is set to HTML…here also ASCII is possible.

[robin.gierse]

@Nagesh.n

[Errno 2] No such file or directory: ‘/usr/sbin/sendmail

This clearly states, that no postfix compatible MTA is installed on the Checkmk server.
Oliver already pointed towards the official guide.
@Nagesh.n have you followed section 3.2 and verified the test mentioned on the bottom of the chapter? HTML mail notifications work, because you configured “Synchronous delivery”, which sends mail directly from Checkmk bypassing the local MTA.