Hi Dominic,
a good way to get in touch with these "big-ones" is usually the mailop
mailing list.
there was a discussion some days ago because of their huge dns failure.
https://www.mail-archive.com/[email protected]/msg08651.html
regards
Thomas Lademann
Am 16.09.19 um 15:51 schrieb Dominic Schlegel:
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’s 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 “same” (the id.server
chaos record tell’s us it’s 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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