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Exchange Admin Center language

Depending on your computer language settings, Exchange Admin Center can take those and open in a language you actually don't want to use.
You'll Google that this can be changed if administrator/ admin user has mailbox by openening OWA settings and changing Regional parameters.

But usually Admin user does not have mailbox or you don't want her/him to have it. You will search again and find that you can add mkt=en-US (as an example) to the URL of the Exchange Admin Center (https://yourexchangehostname/ecp?ExchClientVer=15&mkt=en-US)

Third option you have is opening Internet Explorer settings (I am using Windows 2016)


Click languagesClick Set Language Preferences

Add language you want to use by clicking Add language
Use Move up or Move Down options to put desired language on topClose Internet ExplorerOpen it again and login again to Exchange Admin Center

Exchange queue 451 4.4.0 Primary target IP address responded with: "235 00000...

You might find messages staying in queue on your email server (mixed environment 2007/2010 Exchange) and Error showing:

451 4.4.0 Primary target IP address responded with: "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." Attempted failover to alternate host, but that did not succeed. Either there are no alternate hosts, or delivery failed to all alternate hosts.

  • Check DNS connectivity
  • Check network
  • Check services
  • Open Send connector and check if the server is in source servers list
  • Check O365 connector (if your are trying to send mail from your on-premise environment to O365 user (name on certificate setting or IP setting)

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