Sending NAGIOS alerts to Gmail addresses can get your mail server listed as suspect.

[Marc Powell]

On May 27, 2010, at 4:09 PM, Drew Weaver wrote:

> Hi there,
>  
> I noticed that a lot of our mail was ending up in users' junk/spam folder at GMail and it seems that if you send Nagios warning messages to Gmail they somehow assume that your server is malicious and spamming. Is it SOP to use a different SMTP server to deliver Nagios messages

Does your nagios server send the messages to gmail directly, and not through an SMTP relay? If so, are you following all the rules and expectations for it to be a mail server because to gmail, that's exactly what it is.

	- Is the SMTP server on the machine configured to HELO as a valid fully qualified domain name (hostname.yourdomain.com)?
	- Does hostname.yourdomain.com exist in the DNS and point to the outgoing public IP that gmail sees your message originate from?
	- Does that IP address have a reverse DNS entry of hostname.yourdomain.com?

You can answer most of this by looking at the Received: line in any of the messages where your system hands the message off to Google. 

At the very least a RDNS lookup of the IP should show hostname.yourdomain.com and a lookup of hostname.yourdomain.com should result in that same IP.

--
Marc


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