Microsoft 365: Message Limits

Overview

Message size limits are necessary to prevent large messages from blocking the 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). 

If you need to send a large file, please use the UT Vault service.

Message Limits

Message size limit (including attachments) 50 MB
Size limit for encrypted messages 25 MB
File attachments limit 250 Attachments
Subject length limit 255 Characters

 

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Details

Article ID: 138695
Created
Thu 3/24/22 10:09 AM
Modified
Wed 4/26/23 11:07 AM
Environment
Microsoft 365