Date: Fri, 24 Apr 2015 00:08:00 +0200 From: Harald Becker <ralda@....de> To: musl@...ts.openwall.com Subject: Re: Still not possible to send mail to domain libc.org On 23.04.2015 23:55, Harald Becker wrote: > Hi Rich, > > extending my search on qhe net I found the following: > > All of the senders experiencing the bounced messages mentioning cname > lookup failure appear to be running the qmail mail server software. > > Qmail, if not using a third party patch that was written in the late > 90’s, has an issue sending to domains whose name servers respond to DNS > queries of type “ANY” with more than 512 bytes of data; that is a bug in > qmail and the author has never fixed it because he wants you to use his > DNS server software which also eliminates the issue in a different way. > > Google’s name servers do respond to queries of type “ANY” with more than > 512 bytes of data, so when an unpatched qmail server tries to send an > email to a domain whose lowest cost MX record ends in .google.com, qmail > is going to do a DNS query of type ANY against one of google.com’s > authoritative name servers, get back more than it can correctly handle > and defer repeatedly until ultimately bouncing the message with that > cname lookup failure… Sorry I forgot to add the link: https://productforums.google.com/d/msg/apps/mIGTQVZiFxo/ULesU7hOo6wJ > > Harald >
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