How to create mail contacts of external users on exchange server

How to create mail contacts of external users on exchange server

1. Open Exchange admin center web link https://mailserver/ecp/, navigate to Recipients > Contacts.
2. Click New Add Icon > Mail contact.
3. 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 name that's listed in the directory service. Like the display name, this box is populated by default 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.
• Alias (Required *): Use this box to type an alias (64 characters or less) for the contact. This box is required.
• External email address (Required *):Use this box to type the outside email account of the contact. This box is required. Email sent to this contact is forwarded to this email address.
• Organizational unit 'OU' : You can select an organizational unit (OU) other than the default.

   4. When you've finished, click Save.

   You can Hide the contact from the Address book by editing the created contact ,
then click on 'Hide from address list' option.
   And also, you can have internal mail groups and add the external contacts.