Exchange server 2013 (Build 712.24) on windows server 2012
everything works fine two days ago,
suddenly cannot send email to any mail server outside organization, nothing changed inside organization network, i removed external send connector an created a new one but nothing changed. please help....
Remote Server at yahoo.com (126.96.36.199) returned '400 4.4.7 Message delayed' 10/10/2013 1:45:50 PM - Remote Server at yahoo.com (188.8.131.52) returned '441 4.4.1 Error encountered while communicating with primary target IP address: "Failed to connect. Winsock error code: 10060, Win32 error code: 10060." Attempted failover to alternate host, but that did not succeed. Either there are no alternate hosts, or delivery failed to all alternate hosts. The last endpoint attempted was 184.108.40.206:25'
Transport Log error:
2013-10-10T14:12:41.675Z,ARAD External,08D0939A464A84E9,1,,220.127.116.11:25,*,,"Failed to connect. Winsock error code: 10060, Win32 error code: 10060, Error Message: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond 18.104.22.168:25"
are you sending emails through MX record or Smarthost?
If it is Smarthost, are you able to telnet your smarthost using 25 port number?
Kottees :My Blog Please mark it as an answer if it really helps you.
I recommend you should find the ISP to troubleshoot the issue.
In addition,I found an article about PBL for your reference:
My IP address is on the PBL! What should I do?
Here is a similar thread for your reference:
Hope it helps you!
We are trying to better understand customer views on social support experience, so your participation in this interview project would be greatly appreciated if you have time.
Thanks for helping make community forums a great place.
- Edited by Niko.ChengMicrosoft contingent staff, Moderator Friday, October 11, 2013 9:00 AM