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