SBS2011 and POP3 account

We have an SBS2011 server which was handling POP3 email for one domain and Exchange email for the primary domain.  We were using the POP3 connector for the POP3 account.  We moved the POP3 account to Office365 and removed the POP3 accounts from the POP3 connector.  We are having an issue with sending email from the new Office365 account to the primary account still on the Exchange server.  Also, the users on the Exchange server cannot send mail to the users on the Office365 account.

What do I need to disable on the SBS side to resolve this issue?  Will disabling the AD account for the Office365 users resolve?  Can I just disable Exchange email for those users and still have them log into the domain?
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Larry Struckmeyer MVPCommented:
Well your original method was flawed in that an exchange server, SBS or not, can receive mail for as many domains as you control the MX record.  Either by adding the additional email addresses to the users account or with receive connectors.

I'm not sure what you have done will work but I hope others will chime in.  If it were mine I would not use O365 or any other hosted exchange in addition to local exchange but instead use receive connectors for the alternate addresses on SBS/Exchange.

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jspazianoctoAuthor Commented:
Thanks for the response.  I had originally set up Exchange to receive email from both domains, but we were experiencing lots of issues with the POP3 connector.  Hence, the move to Office365 for the POP3 account.
Larry Struckmeyer MVPCommented:
But no POP account is required is what I am trying to convey.  Just an MX record for the domain pointed to your public IP and a receive connector.
jspazianoctoAuthor Commented:
Thank you for clarifying.  I greatly appreciate the feedback.  It seems that I never needed the pop account in the first place and could have avoided the POP3 connector in SBS.  At this point, though, I am dealing with the issue that I created years ago.  The original POP3 account is now an Office365 account, but I cannot send emails between the Office365 account and the Exchange account remaining on SBS (different domain).  I'm thinking there must be something still on the SBS server causing this mail not to be delivered.
jspazianoctoAuthor Commented:
I just noticed that the domain that I moved to office365 is still listed as an accepted domain in Exchange.  Could this be why mail from Exchange users does not reach the Office365 account?  Would it be safe to remove the Office365 account from accepted domains?
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