Date: Wed, 7 Mar 2001 18:49:42 -0800 From: Gregory Neil Shapiro <gshapiro@FreeBSD.ORG> To: Wm Brian McCane <root@mccons.maxbaud.net> Cc: freebsd-current@FreeBSD.ORG Subject: Re: Email being rejected Message-ID: <15014.62278.946401.639910@horsey.gshapiro.net> In-Reply-To: <Pine.BSF.3.96.1010307195218.36519A-100000@fw.mccons.net> References: <Pine.BSF.4.21.0103080234050.18672-100000@arnold.neland.dk> <Pine.BSF.3.96.1010307195218.36519A-100000@fw.mccons.net>
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root> I am using the standard freebsd.mc created during a buildworld. I root> have started noticing that I am missing/rejecting a lot of emails root> from places like: yahoogroups.com. It would be helpful to show the actual log message so we can determine why it is being rejected. If it is something like: Mar 7 18:45:51 horsey sendmail[69643]: f282jdlg069643: ruleset=check_mail, arg1=<gshapiro@yahoogroups.com>, relay=gshapiro@yahoogroups.com [10.0.1.1], reject=501 5.1.8 <gshapiro@yahoogroups.com>... Domain of sender address gshapiro@yahoogroups.com does not exist Then at the time the mail came in, yahoogroups.com was not resolvable. You can check with: nslookup -q=AAAA yahoogroups.com. nslookup -q=A yahoogroups.com. nslookup -q=MX yahoogroups.com. root> I have been looking in the sendmail config stuff, and I have not yet root> figured out what rule I would need to change, but I need it fixed root> soon, customers are complaining. I think what needs to be done is root> add a rule that says (if it is a TLD, go ahead and accept it). And, root> yes, I realize that means I will get a lot of emails from places root> like: akjasdkfhaskhdf.com, but a "whois" lookup would be WAY TOO root> SLOW. From /usr/share/sendmail/cf/README: FEATURE(accept_unresolvable_domains) Normally, MAIL FROM: commands in the SMTP session will be refused if the host part of the argument to MAIL FROM: cannot be located in the host name service (e.g., an A or MX record in DNS). If you are inside a firewall that has only a limited view of the Internet host name space, this could cause problems. In this case you probably want to use this feature to accept all domains on input, even if they are unresolvable. ... An ``access'' database can be created to accept or reject mail from selected domains. For example, you may choose to reject all mail originating from known spammers. To enable such a database, use FEATURE(`access_db') ... OK Accept mail even if other rules in the running ruleset would reject it, for example, if the domain name is unresolvable. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the messagehelp
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