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 (18.104.22.168) returned '400 4.4.7 Message delayed' 10/10/2013 1:45:50 PM - Remote Server at yahoo.com (22.214.171.124) 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 126.96.36.199:25'
Transport Log error:
2013-10-10T14:12:41.675Z,ARAD External,08D0939A464A84E9,1,,188.8.131.52:25,*,,"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 184.108.40.206:25"
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!
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- Edited by Niko.ChengMicrosoft contingent staff, Moderator Friday, October 11, 2013 9:00 AM