Office 365 configuration in a mixed environment

Run down of our environment

google apps serves as the mail server for our own domain

Some people use the native gmail apps to send and receive emails, but a while ago some people asked to get office 365.

As a test we used 3 accounts that we successfully migrated to office 365 so they use the outlook app as a mail client.

PROBLEM:  Those accounts receive and send mail just fine to anyone EXCEPT people inside the organization which never get the incoming email.

From what I was able to gather, the problem seems to be at the SMTP, since the config seems to be the standard smtp.office365.com (the default config for office365) but I guess that the SMTP thinks that it is in control of the domain (Email wise anyway).

QUESTIONS: Is it possible to change the default SMTP on Office365/Outlook?
If so, How?
What should the SPF record be with this setup?
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frankkyAsked:
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Vasil Michev (MVP)Commented:
Where is you MX currently pointing at, googleapps? If you have added the domain to Exchange Online, messages to people in your organization will always be delivered internally. To fix this issue, set up the domain as a shared domain by following these steps:

Use Exchange Admin Center if you have Office 365
1) Sign in to the Office 365 portal (https://portal.microsoftonline.com) as a global admin.
2) In the header, click Admin, and then click Exchange.
3) In the left navigation pane of the Exchange Admin Center, click Mail Flow, and then click Accepted Domains.
4) Select the domain that is set up for the hybrid deployment, and then click Details.
5) Select Shared, and then click Save.

Use Exchange Control Panel if you have Office 365 pre-upgrade
1) Sign in to the Office 365 portal (https://portal.microsoftonline.com) as a global admin or a service admin.
2) Click Admin, and then under Exchange Online, click Manage.
3) In Exchange Control Panel, click Mail Control, and then click Domains & Protection.
4) Select the domain that is set up for the hybrid deployment, and then click Details.
5) Select Shared, and then click Save.
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frankkyAuthor Commented:
Sorry it took so long,

Under step2, I can click on Admin, but I don't see any exchange there...

Screenshot
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Vasil Michev (MVP)Commented:
It's a drop down menu...

You can use https://outlook.office365.com/ecp/ instead
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frankkyAuthor Commented:
Thanks
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