Date: Thu, 23 Apr 2015 18:33:28 -0400 From: Rich Felker <dalias@...c.org> To: musl@...ts.openwall.com Subject: Re: Still not possible to send mail to domain libc.org On Thu, Apr 23, 2015 at 11:55:30PM +0200, 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. Again there are no CNAMEs involved. > 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. Responses larger than 512 bytes are not supported over UDP and are rarely used. I saw some replies close to that long but none of them had the TC (truncation) bit set, so I don't think that's your issue either. Rich
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