name lookup failed, Sendmail 8.11.x, IPv6

[Barry Margolin]

In article <9l3vkv$7lk at pub3.rc.vix.com>,
 <pelln at icke-reklam.ipsec.nu.invalid> wrote:
>
>Robert Wood <usenet at woodstea.com> wrote:
>> [ This is a repost of the following article:                               ]
>> [ From: Robert Wood <usenet at woodstea.com>                                  ]
>> [ Subject: name lookup failed, v8.11.x, IPv6                               ]
>> [ Newsgroups: comp.mail.sendmail                                           ]
>> [ Message-ID: <9l12g6$13p1$1 at nntp1.ba.best.com>                            ]
>
>> I'm looking for some help with messages that my mail relay is sending
>> out, that are being bounced back because of DNS problems. My mail
>> relay appears to be complaining when the destination server (the
>> one from the MX record) does not have a valid reverse entry for its
>> IP address.
>
>> Why should this be a problem? I though that a mail server was only
>> concerned about the reverse lookup when *receiving* mail from
>> another host.
>
>Some MTA does this check to reduce spam.

How does checking the reverse DNS for the *destination* reduce spam?

-- 
Barry Margolin, barmar at genuity.net
Genuity, Woburn, MA
*** DON'T SEND TECHNICAL QUESTIONS DIRECTLY TO ME, post them to newsgroups.
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