exchange 2010

Getting bounce backs when I try to email users that have email address that end in @katzdigitalgroup.com it is trying to use @domain.onmicrosoft.com.

delivery has  failed to these receipents.

a problem occurred during delivery of this message.
pramod1Asked:
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Scott CSenior EngineerCommented:
Is this a new Exchange Online setup?

There are many items to be configured and they all have to be correct.

Here is my step-by-step for this.
Exchange-Online.docx
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pramod1Author Commented:
these all email addresses are in 0365 migrated from on premise exchange 2010 to o365
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Amit KumarCommented:
seems there is issue with your connectors, because katzdigitalgroup.com's MX are below mentioned.

do you have any static send connectors for above domain or you are using single. check it once...

10      mxa-001b1801.gslb.pphosted.com      148.163.158.1      30 min      Blacklist Check      SMTP Test
10      mxb-001b1801.gslb.pphosted.com      148.163.158.1      30 min      Blacklist Check      SMTP Test
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