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Contact Sales. Chat with sales. Request sales call. Talk with sales. Get Support. Self-help resources. Admin self-help. These limits control the moderation settings that are used for message approval applied to distribution groups and transport rules.
Maximum size of the arbitration mailbox : If the arbitration mailbox exceeds this limit, messages that require moderation are returned to the sender in a non-delivery report NDR.
Maximum number of moderators : The maximum number of moderators that you can assign to a single moderated distribution group or that can be added to a message using a single transport rule. Note that you can't specify a distribution group as a moderator.
Expiration for messages waiting for moderation : By default, a message waiting for moderation expires after two days, and admins cannot extend this interval. However, the processing of expired moderated messages runs every seven days. This means that a moderated message can expire at any time between two and nine days. Maximum rate for expired moderation notification messages : This limit sets the maximum number of notification messages for expired moderated messages in a one-hour period.
This limit is placed on each mailbox database in the datacenter. During periods of heavy usage, some senders may not receive notification messages for moderated messages that have expired. However, these notifications are still discoverable using delivery reports. The following limits apply to Microsoft Exchange ActiveSync, a client protocol that synchronizes mailbox data between mobile devices and Exchange. Exchange ActiveSync device deletion limit : The maximum number of Exchange ActiveSync devices that an Exchange administrator can delete in a single month.
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Note If you need assistance with a task or if you are troubleshooting a problem, you might find the following articles helpful: Email for help creating and sending email Email in Microsoft for business - Admin Help Fix Outlook and Microsoft problems with Microsoft Support and Recovery Assistant Email non-delivery reports Exchange Online Help.
Important The limits applied to a Microsoft organization may differ depending on how long the organization has been enrolled in the service. When a limit is changed in the Microsoft data centers, it can take some time to apply the change to all existing customers.
You can't modify most of these limits, but you and your users should be aware of them. These limits apply to both internal and external recipients.
For information about Office group limits, see "How do I manage my groups? Note A maximum of 20 address lists can be assigned to a single offline address book OAB. Note Using journaling, transport rules, or auto-forwarding rules to copy messages to an Exchange Online mailbox for the purposes of archiving is not permitted.
Note 1 Each user initially receives GB of storage in the archive mailbox. Note 1 This is the default mailbox size for Exchange Server organizations. Note 1 This is the default value for Exchange Server organizations. Note 1 This is the storage quota for the Recoverable Items folder, not the quota for the entire archive mailbox. Note 1 Microsoft recommends no more than 1,, messages per mailbox folder.
Note Some email clients may have lower message size limits or may limit the size of an individual file attachment to a value that is less than the Exchange Online message size limit.
Note This is the maximum file size of a single attachment. Note 1 The default maximum message size for Microsoft mailboxes is 25 MB. Note For distribution groups stored in an organization's address book, the group is counted as one recipient. Note Exchange Online customers who need to send legitimate bulk commercial email for example, customer newsletters should use third-party providers that specialize in these services. Note For the purposes of the recipient rate limit and the recipient limit, a distribution group that is stored in the organization's shared address book counts as one recipient.
Note 1 After the recipient rate limit is reached, messages can't be sent from the mailbox until the number of recipients that were sent messages in the past 24 hours drops below the limit. Note 1 This is the default limit for Exchange Server organizations. Note A soft-deleted user mailbox—a mailbox deleted using the Microsoft admin center or the Remove-Mailbox cmdlet in Exchange Online PowerShell and that is still in the Azure Active Directory recycle bin—is recoverable within 30 days.
Note 1 This is the default value for Microsoft organizations. Note 1 This is the default limit. Note 1 If you are using Azure Active Directory DirSync, the maximum number of distribution group members that you can synchronize from your on-premises Active Directory to Azure Active Directory is 15, Note 1 If a mailbox was migrated to Exchange Online, the inbox rule limit might be set to the value that is lower than the default EXO value.
Submit and view feedback for This product This page. View all page feedback. In this article. Storage quota for Recoverable Items folder in primary mailbox not on hold. Storage quota for Recoverable Items folder in primary mailbox on hold. Storage quota for Recoverable Items folder in archive mailbox not on hold. Storage quota for Recoverable Items folder in archive mailbox on hold.
Warning for number of messages per folder in the Recoverable Items folder. Size limit for encrypted messages for subscribers using Office Message Encryption with new capabilities 5. Size limit for encrypted messages for subscribers using Office Message Encryption legacy version 5.
Size limit for encrypted messages for subscribers using Office Message Encryption with new capabilities 6. Size limit for encrypted messages for subscribers using Office Message Encryption legacy version 6. Character limit for all regular expressions used in all transport rules. Maximum number of recipients added to a message by all transport rules. Hi BrendaTon, I have checked the SR and our engineer had replied you as the followings: "Based my understanding, the issues you may encounter before are: Archive quota is 25GB.
Archive performance is slow when enable default retention policy. I would like to explain these one by one. Archive quota is 25GB, which is incompatible with the 50GB limits. Ans: - Archive mailbox Provision sometimes are done gradually in the backend.
Slow archiving performance. Ans: Slow archiving performance is the main issue we need to address in this case as it may impact your business. Use the PS below after connecting to Exchange online powershell: Get-MailboxStatistics -Identity this is where you type the Email address -archive fl In this way, you can check how many items have flow into your archive mailbox.
Regards, Robert. How satisfied are you with this reply?
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