UACES Facebook Limits within Office 365 Education E1

Limits within Office 365

Recipient and sender limits

These limits are applied to messages, senders, or recipients to combat spam and mass-mailing worms or viruses.

Recipient rate limit - To discourage the delivery of unsolicited bulk messages, Exchange Online has recipient limits that prevent users and applications from sending large volumes of email. These limits are applied per-user to all outbound and internal messages. 

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.

Recipient limit - This is the maximum number of recipients allowed in the To:, Cc:, and Bcc: fields for a single email message. 

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. In a personal distribution list, each recipient is counted separately.

Message rate limit - Message rate limits determine how many messages a user can send within a specified period of time. This limit helps prevent over consumption of system resources by a single sender. If a user submits messages at a rate that exceeds the limit via SMTP client submission, the messages will be rejected and the client will need to retry. For users submitting via any other mechanism, the messages are accepted, but Exchange Online will queue them at the server and throttle the rate of delivery.

Feature

Office 365 Education E1

Recipient rate limit

10,000 recipients per day

Recipient limit

500 recipients

Message rate limit (SMTP client submission only)

30 messages per minute

Distribution (Contact) group limits (personal)

These limits apply to personal distribution (contact) list in a user's address book.

  • Maximum number of contacts per contact list - There is no specific maximum number of contacts because the actual limit is measured in kilobytes, not number of contacts. Exchange has an 8 KB limit on the contacts it can process. So if your contacts only consist of very short email addresses and names, you might be able to create distribution lists with more than 120 addresses. On the other hand, if your contacts contain large amounts of information, you might only be able to add 20 or so before you receive the error "This distribution list has reached the maximum size for your network e-mail server". The 60 to 120 figure is simply a practical average that has been observed over the years.

    There are 2 ways to get around this limitation:
    • Create multiple distribution (contact) lists.
    • Use a third-party provider (extra cost) to manage your personal contact lists. Constant Contact is the current recommended provider. 

  • Accumulated contact limit per email - The limit is not based on the number of contacts in a particular distribution list but the accumulated number of all contacts in the To:, Cc:, and Bcc: fields.

Feature

Office 365 Education E1

Maximum number of contacts per contact list

60 - 120 (see explanation above)

Accumulated contact limit per email

500

Distribution group limits (organization)

These limits apply to distribution groups in your organization's shared address book.

  • Maximum number of distribution group members - The total recipient count is determined after distribution group expansion.

  • 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. Delivery management specifies a list of senders who are allowed to send messages to the distribution group. Message approval specifies one or more moderators who must approve all messages sent to the distribution group.

  • Maximum message size for large distribution groups - If a message is sent to 5,000 or more recipients, the message size can't exceed this limit. If the message size exceeds the limit, the message isn't delivered, and the sender receives a non-delivery report (NDR). The total recipient count is determined after distribution group expansion.

Distribution group limits across Office 365 options 

Feature

Office 365 Education E1

Maximum number of distribution group members

100,000 members

Limit sending messages to large distribution group

5,000 or more members

Maximum message size for large distribution groups

2 MB

Message limits

The following limits are applied to every email message.

  • Message size limit   Message size limits are necessary to prevent large messages from blocking delivery of other messages and affecting service performance for all users. These limits include attachments, and apply organization-wide to all messages (inbound, outbound, and internal). Messages larger than this limit will not be delivered, and the sender will receive a non-delivery report (NDR). While message size limits can be configured up, down, or on a per-user basis, administrators can also create transport rules to limit the maximum size of any individual attachment.

  • Subject length limit   The maximum number of text characters allowed in the subject line of an email message.

  • File attachments limit   The maximum number of file attachments allowed in an email message. Even if the total size of all the file attachments doesn't violate the message size limit, there is still a limit on how many attachments are allowed in the message. This limit is controlled by the multipart message limit.

  • File attachment size limit   The maximum file size of a single attachment. 

  • Multipart message limit   The maximum number of message body parts that are allowed in a MIME multipart message. This limit also controls the maximum number of file attachments that are allowed in a message.

  • Embedded message depth limit   The maximum number of forwarded email messages that are allowed in an email message.

Feature

Office 365 Education E1

Message size limit - Outlook

50 MB

Message size limit - OWA

37.5 MB

Message size limit - Outlook for Mac

35 MB

Subject length limit

255 characters

File attachments limit

250 attachments

File attachment size limit - Outlook

50 MB

File attachment size limit - OWA

25 MB

File attachment size limit - Outlook for Mac

35 MB

Multipart message limit

250 parts

Embedded message depth limit

30 embedded messages

 For more information you can visit the Microsoft Exchange Online Limits webpage - click here.