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Re: [Tools-discuss] Can't send mail to Cenk (Fwd: Undelivered Mail Returned to Sender)

Carsten Bormann <cabo@tzi.org> Fri, 11 December 2020 18:00 UTC

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From: Carsten Bormann <cabo@tzi.org>
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Date: Fri, 11 Dec 2020 19:00:18 +0100
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To: Glen <glen@amsl.com>
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Subject: Re: [Tools-discuss] Can't send mail to Cenk (Fwd: Undelivered Mail Returned to Sender)
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On 2020-12-11, at 18:24, Glen <glen@amsl.com> wrote:
> 
> 4.31.198.44
> 2001:1900:3001:11::2c
> 4.31.198.41
> 2001:1900:3001:11::29
> 192.95.54.41
> 2607:5300:60:9ccf::29

Hmm.

check() {
    addr=$1
    printf "$addr: "
    NAME=`dig +short -x $addr`
    printf "$NAME -> "
    printf `dig +short $NAME A`/
    dig +short $NAME AAAA
}
cat <<HERE | while read addr; do check $addr; done
4.31.198.44
2001:1900:3001:11::2c
4.31.198.41
2001:1900:3001:11::29
192.95.54.41
2607:5300:60:9ccf::29
HERE

4.31.198.44: mail.ietf.org. -> 4.31.198.44/2001:1900:3001:11::2c
2001:1900:3001:11::2c: mail.ietf.org. -> 4.31.198.44/2001:1900:3001:11::2c
4.31.198.41: mail.ietf.org. -> 4.31.198.44/2001:1900:3001:11::2c
2001:1900:3001:11::29: mail.ietf.org. -> 4.31.198.44/2001:1900:3001:11::2c
192.95.54.41: ietfc.amsl.com. -> 192.95.54.41/2607:5300:60:9ccf::29
2607:5300:60:9ccf::29: ietfc.amsl.com. -> 192.95.54.41/2607:5300:60:9ccf::29

I’m sure quite a few mail servers will croak on the v6 address of the second server, and maybe even on the v4 addresses.

Grüße, Carsten

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