Manage recipients in Exchange Online Protection for on-premises organizations

If you use Exchange Online Protection (EOP) for cloud protection of an on-premises email environment, the following types of recipients are available in EOP:

• Mail users: Mail users are the fundamental type of user accounts in EOP. Mail users have sign in credentials in EOP, but they have external email addresses (their mailboxes are located outside of EOP).

  For more information about managing mail users, see Manage mail users in Exchange Online.

• Mail contacts: Contacts have external email addresses, but no sign in credentials in EOP. the mail contact is visible in your organization's shared address book (also known as the global address list or GAL) and other address lists.

  For more information about managing mail contacts, see Manage mail contacts in Exchange Online.

• Groups: You can create the following types of groups in EOP:

  • Microsoft 365 Groups
  • Distribution groups
  • Mail-enabled security groups
  • Dynamic distribution groups

For instructions, see Manage groups in Exchange Online Protection for on-premises organizations.