Exchange 2013 Newly created Distribution groups do not add the X400 address which results in failure of mail distrubution

I have Exchange 2007 and 2013 and working on migration of users and groups from 2007 to 2013. I have noticed that old migrated groups work if I add an external contact to them but newly created on 2013 don't ..

When I got the group configuration it appeared that it didn't have the X400 address on the new one. after I added that address it worked ...

Is this a bug or is there a configuration I'm missing?

Thanks
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Mohammed HamadaSenior IT ConsultantAsked:
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suriyaehnopCommented:
X400 address were used on prior Exchange 2007. Newly DL created in Exchange 20007/2010/2013 will not have x400 address, it will contains only SMTP address.

What do you mean by new DL Exchange 2013 doesn't work?
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Mohammed HamadaSenior IT ConsultantAuthor Commented:
Sorry I meant "DG" distribution groups on Exchange 2013 do not work. when I create new Distribution groups on Exchange 2013 they don't forward mails to members in them unless I add the X400 manually..
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suriyaehnopCommented:
The member of news DL created Exchange 2013 contains user from both Exchange 2007/2013.

Could you create a news DL using Exchange Admin Centre, add mailboxes then send a test email to this DL.

Run message tracking and post the result
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Mohammed HamadaSenior IT ConsultantAuthor Commented:
It was the X400, when I added it.. everything worked! The Message tracking doesn't show any errors.
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Mohammed HamadaSenior IT ConsultantAuthor Commented:
Adding the X400 solved the problem .
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