Send and Receive Limits on Office 356

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.