Office 365 Distribution Groups with External Contacts

I have created a distribution group with the an address of test@abc123.onmicrosoft.com. I added external contacts to the DG. The external contacts have domains of @abc123.com as well as @yahoo.com and @gmail.com. When I send to each contact individually, without the use of the distribution group, all emails arive to the contact addresses. When send to the distribution group only the @gmail.com and @yahoo.com addresses receive the mail. The emails are never received by @abc123.com addresses.

 

abc123.com has never been verified. Any suggestions?
stinkyapeboyAsked:
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justinoleary911Connect With a Mentor Commented:
postini and office 365 dont work together.  theres your .answer, office 365 has the forefront online server it doesnt work correctly with another smart host.

also just an fyi, theres no security risk for you listing your actual domain name, asytinc.com intgrlsystems.com whatever
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justinoleary911Commented:
is abc123.com your domain?  Or are you using the default microsoft generated domain? Also verify the domain, why isn't it verified?  Wheres the MX record for abc123.com pointing?
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stinkyapeboyAuthor Commented:
abc123.com is an example and is not our domain.  No, we are not using a MS generated domain.  Our MX records are pointed to anti spam solution, Google Postini.  Thanks.
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justinoleary911Commented:
did you have any other questions?  Or did I answer them?
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