Office 365 Shared Tenant - Email Send Limits

Question

What are the email sending limits for students and alumni?

Overview

Sending limits for Students and Alumni email accounts in the Office 365 Shared Tenant:

  • 100 external (i.e., out-of-tenant) e-mails sent within any 1 hour period
  • 500 internal (i.e. inside-of-tenant) e-mails sent within any 1 hour period
  • 1500 total e-mails sent within any 24 hour period 

Maximum attachment size for Students using MavMAIL: 35MB
Maximum attachment size for Students using Outlook: 150MB
Maximum attachment size for Alumni using MavMAIL: 35MB

Maximum mailbox size for Students: 100GB 
Maximum mailbox size for Alumni: 50GB

 Rationale

The purpose behind reducing sending limits is to help limit the ability of compromised accounts to inflict harm to other user accounts.  It will additionally reduce necessary cleanup time and efforts after a phishing attack has occurred.

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