Nagios Support Forum

gormank wrote:You might try using SMTP instead of sendmail.

Thanks. I'm not using RHEL but CentOS and ended up switching from sendmail to mailx and it works great now.

I'm having an issue with setting up email notifications. when I check in the nagios.log file, I see this message [1656511916] wproc: early_timeout=0; exited_ok=1; wait_status=19200; error_code=0; [1656511916] wproc: stderr line 01: sendmail: invalid option -- 's' [1656511916] wproc: stderr line 02: ...