Email notification is not working

[raamardhani7]

Hi team,

Yesterday our Nagios server was renamed by infra team and they rebooted the server.After that email notification is not working on the server.

Please find below output for the command tail -25 /var/log/maillog

Apr 14 05:48:50 hostname postfix/error[4482]: 53A6F1055CA: to=<[email protected]>, relay=none, delay=85600, delays=85600/0/0/0, dsn=4.4.3, status=deferred (delivery temporarily suspended: Host or domain name not found. Name service error for name=xyz.com type=MX: Host not found, try again)
Apr 14 05:48:50 hostname postfix/error[4500]: 5196A105145: to=<[email protected]>, relay=none, delay=85653, delays=85653/0/0/0, dsn=4.4.3, status=deferred (delivery temporarily suspended: Host or domain name not found. Name service error for name=xyz.com type=MX: Host not found, try again)
Apr 14 05:48:50 hostname postfix/error[4500]: 5196A105145: to=<[email protected]>, relay=none, delay=85653, delays=85653/0/0/0, dsn=4.4.3, status=deferred (delivery temporarily suspended: Host or domain name not found. Name service error for name=xyz.com type=MX: Host not found, try again)

Could you please help

[mcapra]

Based on this message:

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MX: Host not found, try again

I would double check your machine's DNS settings. Simply put, Nagios XI is unable to resolve the host that you are trying to send emails to.