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Date:      Fri, 13 Jan 2017 22:41:29 -0600
From:      Noel <noeldude@gmail.com>
To:        freebsd-questions@freebsd.org
Subject:   Re: Network problems at FreeBSD.org?
Message-ID:  <389eb990-37d7-664a-ffdd-720af61b7cf8@gmail.com>
In-Reply-To: <52330042975551414b91ef27b3b32c81.squirrel@webmail.harte-lyne.ca>
References:  <52330042975551414b91ef27b3b32c81.squirrel@webmail.harte-lyne.ca>

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On 1/13/2017 11:55 AM, James B. Byrne via freebsd-questions wrote:
> Yesterday I began receiving these error messages from our MTA:
>
> This is the mail system at host inet08.hamilton.harte-lyne.ca.
>
> ####################################################################
> # THIS IS A WARNING ONLY.  YOU DO NOT NEED TO RESEND YOUR MESSAGE. #
> ####################################################################
>
> Your message could not be delivered for more than 0 hour(s).
> It will be retried until it is 5 day(s) old.
>
> For further assistance, please send mail to postmaster.
>
> If you do so, please include this problem report. You can
> delete your own text from the attached returned message.
>
>                    The mail system
>
> <freebsd-questions@freebsd.org>: connect to
>     mx1.freebsd.org[2001:1900:2254:206a::19:1]:25: Network is unreachable
>
>
> Now, I realise that this is a temporary failure and evidence indicates
> that my messages eventually get through.  However, I also note that
> the address given in the error message is in IPv6 notation and I am
> aware that our ISP presently does not provide IPv6 capability.  Has
> something happened at the mailing list end to causes these errors to
> begin to appear?
>

Something changed on your end to either cause IPv6 to be attempted,
or to send you unhelpful zero-delay warnings.

maybe:

http://www.postfix.org/postconf.5.html#delay_warning_time

http://www.postfix.org/postconf.5.html#inet_protocols



  -- Noel Jones


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