Date: Thu, 9 May 2002 08:13:14 -0600 From: "Jason Christians" <jasonc@sdln.net> To: <freebsd-questions@FreeBSD.ORG> Subject: Firewalls, Sendmail, and Bind DNS! Oh my! Message-ID: <AJEHKIHHAKDJGCMIKPEIAEMBCFAA.jasonc@sdln.net>
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I have a strange issue that I have been researching for a while: My email server (Sendmail 8, Bind 9, FreeBSD 4.4) where I work is able to send emails to almost all of the domains out there. Of the domains I am unable to send to, this is the error in the sendmail log file: (note that I changed the email address) reject=451 4.1.8 <email@domain.edu>... Domain of sender address email@domain.edu does not resolve We have a PIX firewall, but the issues existed before and after the PIX firewall. We took it offline, and the mail was still deferred. I have traced this to the fact that we are unable to nslookup on their mx records, while other networks do not have a problem with either the mail or the nslookup, only us. They are all using checkpoint firewalls. I am guessing it is something specific to that firewall. To get around this issue, I decided that maybe adding the following to the sendmail.mc file would give me a temp work-around until we figure out the dns issue. FEATURE(accept_unresolvable_domains) I tried using the m4 processor, but I got a bogus cf file. Here is the command I used: m4 /etc/mail/freebsd.mc > /etc/freebsd.cf What did I do wrong? And, more importantly, will adding that macro help anyway? Any other ideas on this would be most appreciated. Any ideas on why I would be unable to do nslookups while I can "lserver" to another dns server and from there get the nslookup to work? Thanks in advance, Jason ************************************** Jason Christians South Dakota Library Network Senior Computer Specialist jasonc@sdln.net / http://www.sdln.net ************************************** To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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