Mac Shared Calendar invite quiestion

We inherited an all Mac shop. They are running OS X 10.10 with Server 4.1. They have a set of shared calendars set up with a few people on each. We recently needed to add a few people in the org to those groups, but when we add them to the calendar and try to send invites they don't actually go out - at least we're not getting any errors. The email is hosted by GoDaddy. The only Services running on the "Server" are Calendar, Contacts, and File Manager - Mail is not running (does it need to be?)
Jay5990Asked:
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Justin BradshawOwnerCommented:
Invites don't go through email. They're transferred within the calendar system.

Are you using Groups for permissions and assigning them to calendars that way?
Jay5990Author Commented:
So how exactly does this work with external email addresses? We're also having issues with iCalendar with a user on a Surface Pro.
Justin BradshawOwnerCommented:
With external users it goes through email. Though depending on their calendar server system I wouldn't expect those invites to always work properly. You basically have to be on the same calendar server system (exchange, google, iCloud, etc) to make invites work properly.

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burny1Commented:
Not sure if this will help, however we found the following. If you have an apple id and it is an external address, Icloud will not forward calendar invites to this address. You need to log into icloud and under calender preferences / advanced, tick the option Invitations: Receive event invitations as: Email to ...@....  This will then always send all calendar invites to you to your main address and you can accept the invite.
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