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Can you provide a bit more details, it's not really clear what you want to achieve here. Perhaps you mean external (guest) access to Office 365 Group? Or you want to allow external users to send email to O365 DL/group? Or?
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Can you provide a bit more details, it's not really clear what you want to achieve here. Perhaps you mean external (guest) access to Office 365 Group? Or you want to allow external users to send email to O365 DL/group? Or?

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@Vasil_Michev - My client wants to create centrally managed distribution lists of external email addresses that his employees can email to.
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@Vasil_Michev - My client wants to create centrally managed distribution lists of external email addresses that his employees can email to.

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Thank you both. I was hoping there was a bit simpler way to do this, but, alas, MS keeps working.
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Thank you both. I was hoping there was a bit simpler way to do this, but, alas, MS keeps working.

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I have a client using Office 365 who wants to setup group distributions lists for external email addresses. Is there a quick/simple solution for this?
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I have a client using Office 365 who wants to setup group distributions lists for external email addresses. Is there a quick/simple solution for this?

Office 365 Group Distribution Lists

Office 365 is a group of software plus services subscriptions that provides productivity software and related services to its subscribers. Office 365 allows the use of Microsoft Office apps on Windows and OS X, provides storage space on Microsoft's cloud storage service OneDrive, and grants 60 Skype minutes per month. Office 365 includes e-mail and social networking services through hosted versions of Exchange Server, Skype for Business Server, SharePoint and Office Online, integration with Yammer, as well as access to the Office software. All of Office 365's components can be managed and configured through an online portal; users can be added manually, imported from a CSV file, or Office 365 can be set up for single sign-on with a local Active Directory using Active Directory Federation Services.