[TriLUG] help! weird sendmail problem

[Stephen Schaefer]

About the DNS situation: assuming you've got a home
roadrunner connection (business connections included a
static IP and a $256 monthly bill; I don't know
anything more about them):

The roadrunner folks do have a DNS name for your
computer:

$ /sbin/ifconfig eth0
eth0      Link encap:Ethernet  HWaddr
00:00:21:EB:26:6B  
          inet addr:66.57.243.249
[ other stuff elided ]
$ dig -t ptr 249.243.57.66.in-addr.arpa
[ elided ]
;; ANSWER SECTION:
249.243.57.66.in-addr.arpa. 3600 IN	PTR
rdu57-243-249.nc.rr.com.
[ elided ]

So, Road Runner has assigned my machine the
imaginative name of rdu57-243-249 in the domain
nc.rr.com.

$ dig rdu57-243-249
[ elided ]
;; ANSWER SECTION:
rdu57-243-249.nc.rr.com. 3600	IN	A	66.57.243.249
[ elided ]

    - Stephen

--- Greg Brown <gregbrown at mindspring.com> wrote:
> 
> The Facts:
> Red Hat 7.1
> sendmail-8.11.2-14
> connected to my cable modem (outside interface)
> connected to my small networks serving 1 pc (in case
> RR is listening)
> (inside interface).
> 
> My outside interface appears to NOT be able to
> resolve it's domain name.  I
> think this is a RR wide thing.  Is anyone running RR
> able to get a
> resolvable DNS name on the Roadrunner interface on
> the RR network?  If so
> how?  For instance, the command (issued from my
> linux box at work) 'dig
> paloverde.nc.rr.com' does not return an ip address. 
> Does Roadrunner just
> not update DNS entries or simply not support DNS for
> it's DHCP connected
> devices?
> 
> My real question is this:
> 
> Because my outside interface is not DNS resolvable
> some mail servers will
> not accept mail send from my box, an example of this
> is my employer, Lucent.
> Saturday, a day which I was not even in town, my
> mail server attempted to
> send mail to my work address 6480 times!!!  And it's
> been doing this every
> stinking day.
> 
> Upon noticing this I freaked out, then stopped
> sendmail.  I looked in
> /var/spool/mail and sure enough, there were
> references to lucent.com in the
> three files in this directory.  I deleted every file
> in this directory then
> restarted sendmail thinking this would stop the mail
> from going out which
> had not already been delivered.
> 
> No luck.  My machine is still attempting to mail
> lucent.com and the files in
> /var/spool/mail are still empty.
> 
> Any ideas on where to look to get rid of the files
> that is causing this?
> 
> Here's an example of what is showing up in my
> maillog:
> 4:03:18 paloverde sendmail[16406]: g95G0GT14652:
> to=gwbrown1 at lucent.com,
> ctladdr=root (0/0), delay=16:03:02, xdelay=00:00:18,
> mailer=esmtp,
> pri=86730161, relay=ihemail2.lucent.com.
> [192.11.222.163], dsn=4.0.0,
> stat=Deferred: ihemail2.lucent.com.: No route to
> host
> 
> Thanks!!!
> 
> Greg
> 
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>    
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