Home page logo
/

nanog logo nanog mailing list archives

Re: yahoo admin mail contact (or answer)
From: "Jim Ray" <jim () neuse net>
Date: Thu, 16 Aug 2012 13:06:01 -0400

Check reverse DNS. We had same problem with AOL. 

Sent from my iPhone

On Aug 16, 2012, at 12:51 PM, "Georgios Vlachos" <g.vlachos () kestrel-is gr> wrote:

Hello all,



We put into production a new mailserver 2 weeks ago, and we can send email
to everybody (no complaints and testing) except yahoo!



All their mailservers reset the TCP connections, before SMTP even starts.
This happens randomly on all their mta (look below). As a sequence almost
half the email we send to yahoo stay in the queue for a day in our
mailserver and then get discarded (with a connection died message).



We get the SYN, SYN-ACK, ACK normal handshake and then a TCP reset from
their mailserver.



Any idea or off-list contact is very welcome.



From their website I could not find a way to email them.



C:\Windows\system32>dig yahoo.com MX



; <<>> DiG 9.3.2 <<>> yahoo.com MX

;; global options:  printcmd

;; Got answer:

;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 970

;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 24



;; QUESTION SECTION:

;yahoo.com.                     IN      MX



;; ANSWER SECTION:

yahoo.com.              72      IN      MX      1 mta6.am0.yahoodns.net.

yahoo.com.              72      IN      MX      1 mta7.am0.yahoodns.net.

yahoo.com.              72      IN      MX      1 mta5.am0.yahoodns.net.



;; ADDITIONAL SECTION:

mta6.am0.yahoodns.net.  141     IN      A       66.196.118.34

mta6.am0.yahoodns.net.  141     IN      A       66.196.118.36

mta6.am0.yahoodns.net.  141     IN      A       67.195.168.230

mta6.am0.yahoodns.net.  141     IN      A       98.136.217.202

mta6.am0.yahoodns.net.  141     IN      A       98.139.54.60

mta6.am0.yahoodns.net.  141     IN      A       66.94.237.64

mta6.am0.yahoodns.net.  141     IN      A       66.94.237.139

mta6.am0.yahoodns.net.  141     IN      A       66.94.238.147

mta7.am0.yahoodns.net.  289     IN      A       98.139.54.60

mta7.am0.yahoodns.net.  289     IN      A       66.94.236.34

mta7.am0.yahoodns.net.  289     IN      A       66.94.237.64

mta7.am0.yahoodns.net.  289     IN      A       66.196.118.33

mta7.am0.yahoodns.net.  289     IN      A       66.196.118.35

mta7.am0.yahoodns.net.  289     IN      A       67.195.168.230

mta7.am0.yahoodns.net.  289     IN      A       98.136.216.26

mta7.am0.yahoodns.net.  289     IN      A       98.136.217.202

mta5.am0.yahoodns.net.  185     IN      A       66.196.118.35

mta5.am0.yahoodns.net.  185     IN      A       66.196.118.36

mta5.am0.yahoodns.net.  185     IN      A       98.136.216.25

mta5.am0.yahoodns.net.  185     IN      A       98.136.216.26

mta5.am0.yahoodns.net.  185     IN      A       98.136.217.202

mta5.am0.yahoodns.net.  185     IN      A       66.94.236.34

mta5.am0.yahoodns.net.  185     IN      A       66.94.238.147

mta5.am0.yahoodns.net.  185     IN      A       66.196.118.34



Thank you,



Georgios Vlachos

___________________________

Kestrel Information Systems s.a.

340, Kifissias Ave., 

154 51, Neo Psychico, Athens

Τ.: +30.210.6747740, ext. 105

F.: +30.210.6771585

M.: +30.6936 807513



<http://www.kestrel-is.gr/> logo kestrel.jpg




  By Date           By Thread  

Current thread:
[ Nmap | Sec Tools | Mailing Lists | Site News | About/Contact | Advertising | Privacy ]
AlienVault