Sendmail Email Unable to send... do not know w here to change this

[Carroll, Jim P [Contractor]]

Minor quibble #1:  'Monitor' isn't a domain name (or FQDN (Fully Qualified
Domain Name)).

Minor quibble #2:  'Monitor' should be 'monitor'.  It's always recommended
that you use lowercase names, but that your system accept lower/uppercase.
(I've seen problems in the past when the hostname began with an uppercase
character.)

Evidently your mailhost (raq3.imaginuity.com) isn't able to confirm that the
forward and reverse lookups for Monitor match.  (It's a setting meant to
minimize spammers falsifying their sender address and/or using your mailhost
as a relay for their nefarious tasks.)

Do this:

- in the DNS that raq3.imaginuity.com knows about, add the A record for
'monitor.imaginuity.com'
- change your Nagios hostname to 'monitor'
- look for the macro in /etc/sendmail.cf called "Dj" (it will be at the
beginning of the line, and there should only be one occurrence of it) -
change everything after "Dj" to 'monitor.imaginuity.com' so that you end up
with "Djmonitor.imaginuity.com"
- restart sendmail on your Nagios host
- send a test e-mail from your Nagios host to 'vance.duke at imaginuity.com'

If this still fails, you might have an unusual setup.  You might want to
consider installing nullmailer on your Nagios host.

Let us know how it goes.

jc

> -----Original Message-----
> From: Vance Duke [mailto:vance.duke at imaginuity.com]
> Sent: Friday, December 06, 2002 7:55 AM
> To: Nagios-users at lists.sourceforge.net
> Subject: [Nagios-users] Sendmail Email Unable to send... do not know
> where to change this
> 
> 
> 
> Here is the bounce back that I am getting.  I assume it is because the
> Domain for the email address is Monitor (which is the machine 
> name).  In the
> NAGIOS.CFG I have set the Administrator Email address to
> "vance.duke at imaginuity.com".
> 
> This error I am getting when trying to send mail from within 
> Sendmail, and
> this is the bounce back.
> 
> > The original message was received at Thu, 5 Dec 2002 
> 15:56:13 -0600 from
> root at localhost
> >
> >    ----- The following addresses had permanent fatal errors -----
> > vance.duke at imaginuity.com (reason: 501 <nagios at Monitor>... 
> Sender domain
> must exist)
> >
> >    ----- Transcript of session follows -----
> > ... while talking to raq3.imaginuity.com.:
> > >>> MAIL From:<nagios at Monitor> SIZE=354
> > <<< 501 <nagios at Monitor>... Sender domain must exist
> > 501 5.6.0 Data format error
> 
> 
> This is the log information from the Sendmail log.
> 
> > Dec  5 15:56:13 Monitor sendmail[4267]: gB5LuDI04267: 
> from=nagios at Monitor,
> size=354, class=0, nrcpts=1, 
> msgid=<200212052156.gB5LuDI04267 at Monitor>,
> relay=root at localhost
> > Dec  5 15:56:13 Monitor sendmail[4270]: gB5LuDI04267:
> to=vance.duke at imaginuity.com, ctladdr=nagios at Monitor (500/500),
> delay=00:00:00, xdelay=00:00:00, mailer=esmtp, pri=30354,
> relay=raq3.imaginuity.com. [216.234.235.10], dsn=5.6.0, 
> stat=Data format
> error
> > Dec  5 15:56:13 Monitor sendmail[4270]: gB5LuDI04267: 
> gB5LuDH04270: DSN:
> Data format error
> 
> I do not know if this a Nagios issue or a Sendmail issue, and 
> any help would
> be appreciated.
> 
> Thanks,
> Vance Duke
> 
> 
> 
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