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How to give permission to user to send email to mail group on Exchange Admin Center Login to Exchange Admin Center web link https://mailserver/ecp  Go to recipients , then groups then select a group that you want to give a user permission to send email to. Go to delivery management , here Click Plus sign to add a user to give permission to send email to this group. The default option is  ‘Only senders inside my organization’ .and  there is other option to make a group to receive external emails as well, 

How to create mail contacts of external users on exchange server Open Exchange admin center web link https://mailserver/ecp/ , navigate to Recipients > Contacts . Click New Add Icon > Mail contact . Complete the following boxes on the New mail contact page: First name : Use this box to type the contact's first name. Initials(Optional) :   Use this box to type the contact's initials. Last name : Use this box to type the contact's last name. Display name(Required *) : Use this box to type a display name of the contact. This is the name that's listed in the contacts list in the EAC and in your organization’s address book. By default, this box is populated with the names you enter in the First name, Initials, and Last name boxes. If you didn't use those boxes, you must still type a name in this box because it’s required. The name can't exceed 64 characters. Name (Required *) : Use this box to type a name for the contact. This is the nam...