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Posted on 2003-12-05
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Last Modified: 2010-04-20
I get the following error when trying to send an email to some people that i've sent plenty of email to in the past... (reason: 550 5.7.1 This system is configured to reject mail from 216.219.239.109 (DNS reverse lookup failed))... Any suggestions?

I'm using sendmail btw.
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Question by:rsumilang
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jlevie earned 200 total points
ID: 9883905
It looks like the server you are trying to send the mail to has been configured to reject mail from any source that doesn't satisfy a reverse DNS check. Usually that means that the forward & reverse DNS lookups must return identical data and in some cases the professed hostname offered by your server must match what is returned by DNS. This is commonly done as a part of anti-spam protection.

There are two possible solutions. One is to properly set up the DNS for your domain to have the correct forward and reverse zone data. For  standard commercial network accounts that might mean getting your provider to create the reverse zone data if in-addr.arp authority for your netblock hasn't been delegated to you. The other solution, which is applicable to ordinary "dial up" type accounts, is to use your ISP's mail server as a smart host. That makes all of the mail appear to come from a server that has valid DNS data.
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by:rsumilang
ID: 9884652
I got the issue resolved with my hosting provider because the IP did not contain an PTR record. Thanks
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