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Date: Sat, 18 Apr 2015 20:13:50 +0200
From: Harald Becker <>
Subject: Re: Re: Security advisory for musl libc - stack-based buffer
 overflow in ipv6 literal parsing [CVE-2015-1817]

Hi Rich !

On 18.04.2015 18:37, Rich Felker wrote:
> Odd. I just verified that  Google's resolves it right, so I
 > don't know what's wrong, but it seems to be on your end. Let me know
 > if you find anything that looks like a problem on my side.

I verified this again:

A-record lookup gets correct address, but MX lookup get's:    mail exchanger = 10

... and that neither works when using Mozilla Thunderbird, nor claws 
mail on any current Linux distribution, when sending through the mail 
relay of GMX (United Internet = one of the major Internet provider in 
Germany). The SMTP to the mail relay rejects any mail to domain 
(SMTP error response).

Sorry it's neither my software, nor is there any way for me to change 
the kind of lookup done on the mail relay of the provider. Postmaster 
answer of mail relay was simple: Not a failure of mail relay, your MX 
lookup erroneously return a CNAME and not an IP address.


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