Following are the limits for sending and receiving emails for your Office 365 order.
Description | Business Essential | Business Premium |
---|---|---|
Receiving Limits | 3,600 messages per hour | 3,600 messages per hour |
Sending Message rate limit | 30 messages per minute | 30 messages per minute |
Message size limit - Outlook | 150 MB | 150 MB |
Message size limit - OWA | 112 MB | 112 MB |
Subject length limit | 255 characters | 255 characters |
File attachments limit | 250 attachments | 250 attachments |
File attachment size limit - Outlook | 150 MB | 150 MB |
File attachment size limit - OWA | 35 MB | 35 MB |
For more information you can visit Microsoft's website.