In our Exchange 2013 Environment having two CAS & MBX servers: CAS: CAS01, CAS002
MBX:MBX01, MBX02
In MBX01 mails flowing to all recipient working properly.
From MBX02 the mails going only to office 365 migrated users from on prem getting stagged in queue and after bouncing back to the sender. other mails flowing through MBX02 is working properly.
I am to able to telnet MBX02 25,465
I checked the MBX02 Queue viewer logs it showing :
2016-07-16T00:03:09.644Z,1,QUEUE,MBX02\4104,Retry,DnsConnectorDelivery,domaingbl.mail.onmicrosoft.com,(domaingbl.mail.onmicrosoft.com)::1:1:57f5de:0::0:0:;,379,0,0,0,0,0,External,Normal,0,57f5deaa-339f-4a2f-9fde-65303ff1de99,,"451 4.4.0 Primary target
IP address responded with: ""421 4.4.1 Connection timed out."" Attempted fail",,
2016-07-16T00:03:09.644Z,,SUMMARY,,,,,,,,,,,,,,,,,,TotalMessageCount = 379; PoisonMessageCount = 0,
2016-07-16T00:03:09.644Z,,SUMMARY,,,,,,,,,,,,,,,,,,TotalMessageCount = 379; PoisonMessageCount = 0,
Time being I am redirecting the mails from MBX02 to MBX01 using this shell command; Redirect-Message -Server MBX02 -Target MBX01.contoso.local
Please help me to resolve..
Sabarish B