How to setup an external contact in Exchange 2010

I need to add an external contact to a distribution list. When using the EMC to create the new contact and trying to copy/paste the email address I receive the error message "Some controls are invalid. The address SMO-XXXX@domain.onmicrosoft.com is not a valid SMTP addresss.
Hunter24Office 365 Support EngineerAsked:
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ReneD100Connect With a Mentor Commented:
You need to create an address for the contact on the local domain, eg user_external@yourlocaldomain.com and then add a 2nd SMTP address (SMO-XXXX@domain.onmicrosoft.com) which you can set as the default address
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Neil RussellTechnical Development LeadCommented:
To add an external email to an exchange distribution group you must create an exchange Contact that has that email address and then you can add the contact into the distribution list.
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Hunter24Office 365 Support EngineerAuthor Commented:
That's what trying  to do, but I can't create the contact, an error message is displayed when I add the email address for that contact.
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Hunter24Office 365 Support EngineerAuthor Commented:
I found out that you cannot paste the email, the same must be entered manually, when done that I was able to create the contact and add it to the DL. Thank you very much.
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