unable to send mail to external mail servers (yahoo, hotmail,google,...)

    General discussion

  • 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....

    NDR Reply:

    Remote Server at ( returned '400 4.4.7 Message delayed' 10/10/2013 1:45:50 PM - Remote Server at ( 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'

    Transport Log error:

    2013-10-10T14:12:41.675Z,ARAD External,08D0939A464A84E9,1,,,*,,"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"

    Thursday, October 10, 2013 2:31 PM

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