Stats from 9 to 10 (CET) from my IPs:

6171: "250 ok dirdel"
  53: "451 4.3.2 Internal error reading data" in reply to the MAIL FROM
command.
  96: "451 Resources temporarily not available - Please try again later
[#4.16.5]." in reply to "."
   5: "421 4.7.0 [GL01] Message from (XXXXXXXX) temporarily deferred -
4.16.50. Please refer to
http://postmaster.yahoo.com/errors/postmaster-21.html  in reply to MAIL FROM

So, less than 3% of messages fails with the 2 errors you saw.
Looking at past logs it is not unusual and I see a similar occourence also
in the past weekdays.

Stefano

On 30 March 2017 at 09:47, Yves-Marie Le Pors Chauvel <
ym.leporschau...@ccmbenchmark.com> wrote:

> Hi,
>
> I've just show that Yahoo seems to defer many mails since one hour. This
> is the exact same from all my IPs
>
> All messages are :
>
> Mar 30 09:38:15 lxc-postfix-front-19 postfix-smtp56/smtp[1403]:
> 87CFE4C2BFC0C: to=<xxxxx...@yahoo.fr>, 
> relay=mx-eu.mail.am0.yahoodns.net[188.125.69.79]:25,
> delay=2.1, delays=0.13/0/0.22/1.8, dsn=4.0.0, status=deferred (host
> mx-eu.mail.am0.yahoodns.net[188.125.69.79] said: 451 Resources
> temporarily not available - Please try again later [#4.16.5]. (in reply to
> end of DATA command))
>
> Mar 30 09:18:01 vz-postfix-front-06 postfix-smtp43/smtp[27014]:
> 6B3856383F933: to=<xxxxxx...@yahoo.co.uk>, relay=mx-eu.mail.am0.yahoodns.
> net[188.125.69.79]:25, delay=0.23, delays=0.08/0/0.13/0.02, dsn=4.3.2,
> status=deferred (host mx-eu.mail.am0.yahoodns.net[188.125.69.79] said:
> 451 4.3.2 Internal error reading data (in reply to MAIL FROM command))--
>
> Does any one have the same messages ?
>
> Regards,
> Yves-Marie LE PORS-CHAUVEL
>
>
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>
>
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