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From: Kurt H Maier <khm@sciops.net>
Newsgroups: gmane.linux.lib.musl.general
Subject: Re: Re: Security advisory for musl libc - stack-based buffer
 overflow in ipv6 literal parsing [CVE-2015-1817]
Date: Mon, 20 Apr 2015 11:20:32 +0000
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Quoting Harald Becker <ralda@gmx.de>:

> Hi Rich !
>
> Sending mail still fails, see appended screen shot of Thunderbird message!

Testing this, I get random failures and/or delays when looking up
libc.org MX records, usually from DNS3.REGISTRAR-SERVERS.COM. This
is probably what's happening to you as well, except your software is
giving up instead of retrying.

khm