When it comes to sending messages through Microsoft 365, you may have some questions that directly affect your email experience:
- Are any sending size limits applied to email messages?
- What recipient limits are applied to email messages?
The limits on messages, mailboxes, recipients, and email clients fall into one of the following categories:
- Message limits
- Recipient and sender limits
- Retention limits
- Distribution group limits
- Transport rule limits
- Moderation limits
Important - Please be aware of the following:
- The limits applied to your domain may differ depending on how long your domain has been enrolled in the service. When a limit is changed in the Microsoft datacenters, it can take some time to apply the change to all existing customers.
- You can't modify most of these limits, but you should be aware of them.
- These limits apply to both internal and external recipients.
1.) Message limits
- These limits are applied to every email message.
2.) Recipient and sender limits
|
Limit
|
Value
|
|
Recipient limit: The maximum number of
message recipients allowed in the To, Cc, and Bcc
fields.
|
Student:
- 500 recipients internal (per hour)
- 500 recipients external (per hour)
- 500 recipients maximum (per day)
Staff:
- 1000 recipients internal (per hour)
- 500 recipients external (per hour)
- 5000 recipients maximum (per day)
|
|
Message rate limit: The maximum number of email
messages that can be sent from a single e-mail
client per minute. The client is identified by the
user account.
|
30 messages per minute
|
- These limits are applied to messages, senders, and recipients to combat spam and mass-mailing worms or viruses.
- Note: For distribution groups stored in the shared address book, the group is counted as one recipient. For distribution groups stored in the Contacts folder of a mailbox, the members of the group are counted individually.
3.) Retention limits
- These limits control the amount of time that items in specific folders in the Inbox are accessible.
4.) Distribution group limits
- These limits apply to distribution groups.
5.) Transport rule limits
- These limits control organization-wide rules, als known as transport rules.
6.) Moderation limits
- These limits control moderation settings used for message approval applied to distribution groups and transport rules.