Hi Thomas Thank you for the pointer.
Regards Dominic > On 16 Sep 2019, at 22:08, Thomas Lademann <[email protected]> wrote: > > 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 > <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 >> >> >> >> _______________________________________________ >> swinog mailing list >> [email protected] <mailto:[email protected]> >> http://lists.swinog.ch/cgi-bin/mailman/listinfo/swinog >> <http://lists.swinog.ch/cgi-bin/mailman/listinfo/swinog> > > _______________________________________________ > swinog mailing list > [email protected] > http://lists.swinog.ch/cgi-bin/mailman/listinfo/swinog
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