The following reply was made to PR bin/32888; it has been noted by GNATS.

From: jnemeth@victoria.tc.ca (John Nemeth)
To: gnats-bugs@NetBSD.org, gnats-admin@NetBSD.org,
	netbsd-bugs@NetBSD.org, i18rabbit@cwazy.co.uk
Cc: 
Subject: Re: bin/32888: send-pr
Date: Thu, 23 Feb 2006 23:49:04 -0800

 On Jun 10,  7:07pm, i18rabbit@cwazy.co.uk wrote:
 }
 } The following reply was made to PR bin/32888; it has been noted by GNATS.
 } 
 } From: i18rabbit@cwazy.co.uk
 } To: gnats-bugs@netbsd.org
 } Cc: 
 } Subject: Re: bin/32888: send-pr
 } Date: Fri, 24 Feb 2006 06:57:57 GMT
 } 
 }  >  }  it appears that gnats.netbsd.org rejects
 }  >  }  mail sent from NetBSD machines behind a
 }  >  }  proxy server (FreeBSD using ppp NAT).
 }  >  }
 }  >  }  gnats.netbsd.org doesn't accept the email
 }  >  }  because it can't lookup the local domain
 }  >  }  behind the proxy - but netbsd.org doesn't
 }  >  }  mind.  eg, if the proxy server is
 }  >  }  abc.mytelco.org, and i email from
 }  >  }  localmachine.abc.mytelco.org, it
 }  >  }  will bounce from gnats.netbsd.org
 }  >  }  because it can't do a reverse DNS
 }  >  }  lookup on that domain.  netbsd.org
 }  >  }  doesn't complain.  i don't think it
 }  >  }  is a local configuration problem, but
 }  >  }  more due to the fact that my ISP doesn't
 }  >  }  pass DNS requests down to my server.
 }  > 
 }  >  It sounds like you are saying that you are sending mail out with a
 }  >  return address of a.x.y.z, where x.y.z exists in the public DNS, but
 }  >  a.x.y.z does not.  If so, then this is indeed a local configuration
 }  >  problem as you are sending e-mail out with an invalid return address.
 }  >  Look up masquerade in /usr/share/sendmail/README.
 }  
 }  the first part of what you say is true, i am emailing
 }  from a host on a local network behind NAT stuff.
 
      The message will appear to come from the "NAT stuff".
 
 }  but i am not sending out email with an invalid return
 }  address.  if i was, how would i be getting this email?
 }  
 }  all my local DNS works fine, and if it received a query
 }  for local machines behind the NAT server, it would
 }  respond correctly, but ISP's don't pass those queries
 }  down to their static IP customers typically.
 
      This really doesn't matter and it happens all the time.
 
      Do you have a sample of a message that bounced complete with all
 the headers?  This would greatly help in figuring out what is going
 on.
 
 }-- End of excerpt from i18rabbit@cwazy.co.uk