Yahoo Mail Delivery Issues

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Hi All

We are experiencing problems delivering mails for domains having their =
MX record set to mx-eu.mail.am0.yahoodns.net (for example yahoo.it, =
yahoo.de, yahoo.co.uk). So far we have figured out that Yahoo=E2=80=99s =
DNS servers send different responses. Depending on the DNS response we =
are able to establish SMTP connections. Below example shows 2 servers =
from their DNS that seems to accept SMTP connections:

[root@x1:~] # dig a mx-eu.mail.am0.yahoodns.net @yf2.yahoo.com +short
188.125.72.73
188.125.72.74

[root@x1:~] # telnet 188.125.72.73 25
Trying 188.125.72.73...
Connected to mtaproxy1.free.mail.vip.ir2.yahoo.com.

[root@x1:~] # telnet 188.125.72.74 25
Trying 188.125.72.74...
Connected to mtaproxy2.free.mail.vip.ir2.yahoo.com.

On the other hand we sometimes get other replies from the =E2=80=9Csame=E2=
=80=9D (the id.server chaos record tell=E2=80=99s us it=E2=80=99s a =
different one) DNS server with different A records that do not accept =
SMTP connections:

[root@x1:~] # dig a mx-eu.mail.am0.yahoodns.net  @yf2.yahoo.com +short
188.125.73.87
212.82.101.46

[root@x1:~] # telnet 188.125.73.87 25
Trying 188.125.73.87...
telnet: connect to address 188.125.73.87: Operation timed out
telnet: Unable to connect to remote host

[root@x1:~] # telnet 212.82.101.46 25
Trying 212.82.101.46...
telnet: connect to address 212.82.101.46: Operation timed out
telnet: Unable to connect to remote host


We have so far confirmed this behaviour from different AS (Hetzer, OVH). =
Does anybody else experiencing the same behaviour?

We have tried to contact their postmaster address and few others we =
found on the internet. Unfortunately so far no one was really able to =
help us. The Yahoo Small Business Phone Number that has been posted on =
this list back in October 2009 seems no longer to be in operations too. =
Therefore if you know how to get in touch with their technical staff =
that would be much appreciated.


Best Regards
Dominic Schlegel


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