Exchange-Online.docx

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these all email addresses are in 0365 migrated from on premise exchange 2010 to o365
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these all email addresses are in 0365 migrated from on premise exchange 2010 to o365

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seems there is issue with your connectors, because katzdigitalgroup.com's MX are below mentioned.<br />
<br />
do you have any static send connectors for above domain or you are using single. check it once...<br />
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10 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;mxa-001b1801.gslb.pphosted<wbr />.com &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;148.163.158.1 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;30 min &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Blacklist Check &nbsp; &nbsp; &nbsp;SMTP Test<br />
10 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;mxb-001b1801.gslb.pphosted<wbr />.com &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;148.163.158.1 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;30 min &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Blacklist Check &nbsp; &nbsp; &nbsp;SMTP Test
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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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<div class="content wysiwyg-content">
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.<br />
<br />
delivery has &nbsp;failed to these receipents.<br />
<br />
a problem occurred during delivery of this message.
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</div>


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.

exchange 2010

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.

Email Servers

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.