Message approval specifies one or more moderators who must approve all messages sent to the distribution group. Delivery management specifies a list of senders who are allowed to send messages to the distribution group. Limit sending messages to large distribution groups: Distribution groups that contain the number of members specified by this limit must have delivery management or message approval options configured. Maximum number of distribution group members: The total recipient count is determined after distribution group expansion.

These limits apply to distribution groups in your organization's shared address book. Administrators can change this value for their organization. To receive messages again, the user must delete email until the mailbox is below the size limit.Ĭapacity alerts across standalone plans Featureġ This is the default value for Exchange Server organizations. The sender has the option to try resending the mail later. Prohibit Send/Receive: Exchange Online rejects any incoming mail when the mailbox size limit is reached, and sends a non-delivery report (NDR) to the sender.

The user can't send new messages until enough email is deleted to bring the mailbox below the size limit. Prohibit Send: The user receives a prohibit-send notification email when the mailbox size limit is reached. This warning is intended to encourage users to delete unwanted mail. Warning: The user receives an email warning that the mailbox is approaching the maximum size limit. Microsoft 365 Business Basic and StandardĪddress book limits across standalone plans FeatureĮxchange Online provides three kinds of notifications when a user's mailbox is nearing, or at, capacity: Global address lists: The maximum number of global address lists (GAL) that be created in an Exchange Online or Exchange Server organization. Offline address book limit: The maximum number of offline address books (OAB) that can be created in an Exchange Online or Exchange Server organization.Īddress book policies limit: The maximum number of address book policies (ABP) that be created in an Exchange Online or Exchange Server organization. The maximum size of a single offline address book is 1GB.

A maximum of 20 address lists can be assigned to a single offline address book (OAB).

Exchange 2016 attachment size limit