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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