Setting the MAILFROM variable in RHEL8 and RHEL9 crontabs when HOSTNAME is not defined
In a typical Linux environment, the cron daemon sends email notifications to the system administrator when a scheduled job fails or completes. By default, the MAILFROM variable in the crontab file is set to
Understanding the Problem
When the HOSTNAME variable is not defined, the MAILFROM variable in the crontab file is set to
Solution: Setting the MAILFROM Variable Manually
To solve this problem, you can set the MAILFROM variable manually in the crontab file. Here's how to do it:
- Open the crontab file using the crontab -e command.
- Add the following line at the beginning of the file:
MAILFROM=cron-<username>@ourdomain.com- Replace
with your actual username. - Save and close the file.
Verifying the Solution
To verify that the MAILFROM variable is set correctly, you can run a test cron job and check the email notification. Here's how to do it:
- Add the following line to the crontab file:
* * * * * echo "This is a test email" | mail -s "Test Email" [email protected]- Replace [email protected] with your actual email address.
- Save and close the file.
- Wait for one minute for the cron job to run.
- Check your email for the test email notification.
- Verify that the MAILFROM variable is set correctly in the email header.
References
Types of references:
- Online resources
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